The tyre is flat at the side of the road, and the compressor in the boot will not run. It is not broken — it is the wrong voltage for the vehicle, or the wrong tool for the tyre. A 12V compressor and a 24V compressor are not the same tool, and buying the wrong one costs you the journey.
Most 12V compressors clip to the car battery and fill a truck tyre in minutes. Most 24V inflators run on a tool battery and top off a car tyre without starting the engine. And a third kind — cordless, battery-powered, with a 12V cord as backup — does neither job quite the same way.
This guide compares five compressors on maker documents and owner reports alone: three 12V VIAIR models, the true 24V Greenworks inflator, and the cordless WOLFBOX MegaFlow24 Pro, with airflow, duty cycle and tyre size for each. Every pick carries a verified Amazon button, or a disclosed substitute.
The 30-second answer
Buy the VIAIR 400P for the best 12V compressor here: 150 PSI, 2.30 CFM and tyres up to 35 inches. Buy the VIAIR 88P for the best budget 12V pick, at 120 PSI for tyres up to 33 inches, as a written alternative — no verified Amazon listing exists, so the VIAIR 300P is the substitute button below it. Buy the VIAIR 300P for the best mid-range 12V pick, with the same 150 PSI and 2.30 CFM as the 400P. Buy the Greenworks 24V for the only true 24V pick here, at 160 PSI on a tool battery or a 12V outlet, as a written alternative — no verified Amazon listing exists, so the WOLFBOX MegaFlow24 Pro is the substitute button below it. Buy the WOLFBOX MegaFlow24 Pro for the cordless third way — a battery-powered inflator with a 12V cord, not a 24V unit.
How we researched this guide
We profiled seven air compressors, checked five maker documents and user manuals, verified three Amazon listings, and reviewed five groups of owner reports from compressor roundups, reviews and forums. Five picks made the slate; the VIAIR 88P and the Greenworks inflator are carried as written alternatives because no Amazon listing for either could be verified with a live offer, and two were excluded — a VIAIR 400P-RV, the RV-specific variant of the 400P with the same hardware, and a UUP 12V dual-cylinder inflator whose listing showed no featured offers and whose availability could not be verified.
Quick picks
Best Overall
VIAIR 400P
A 12V compressor at 150 PSI and 2.30 CFM, for tyres up to 35 inches. The best 12V pick.
Best Budget
VIAIR 88P
A 12V compressor at 120 PSI and 1.47 CFM, for tyres up to 33 inches. The budget pick. — as a written alternative, because no verified Amazon listing exists for it.
Written alternative: no verified Amazon listing for this compressor, so this pick has no direct buy button. The button below goes to the VIAIR 300P, the verified substitute — the same 12V clamp-on compressor with more airflow.
Best Mid-Range
VIAIR 300P
A 12V compressor at 150 PSI and 2.30 CFM, for tyres up to 33 inches. The mid-range pick.
Best 24V
Greenworks 24V Cordless Tire Inflator
A true 24V inflator at 160 PSI, on a tool battery or a 12V outlet. The 24V pick. — as a written alternative, because no verified Amazon listing exists for it.
Written alternative: no verified Amazon listing for this inflator, so this pick has no direct buy button. The button below goes to the WOLFBOX MegaFlow24 Pro, the verified substitute — a cordless inflator on battery or 12V power, not 24V.
Best Cordless
WOLFBOX MegaFlow24 Pro
A battery-powered inflator at 150 PSI with a 12V cord, not a 24V unit. The cordless third way.
Match a compressor to your tyres, your vehicle and your power
Compressor calculator — enter your own requirements
Step 1 — What are you inflating?
Step 2 — How much compressor experience do you have?
Step 3 — What matters most?
Tell the calculator what you drive first — a car and a truck need different compressors. Add your experience and what matters most, and your matching pick appears here, with its buying route stated honestly.
Quick compare
| Product | Voltage | Max PSI | Best for | Power source | Check Price |
|---|---|---|---|---|---|
| VIAIR 400P | 12V DC | 150 PSI | Tyres up to 35 inches | Battery clamps | Check Price |
| VIAIR 88P | 12V DC | 120 PSI | Tyres up to 33 inches | Battery clamps | Check Price (substitute) |
| VIAIR 300P | 12V DC | 150 PSI | Tyres up to 33 inches | Battery clamps | Check Price |
| Greenworks 24V Cordless Tire Inflator | 24V battery / 12V outlet | 160 PSI | Car top-offs | Tool battery or 12V outlet | Check Price (substitute) |
| WOLFBOX MegaFlow24 Pro | Battery / 12V DC | 150 PSI | Cordless inflation | Battery or 12V cord | Check Price |
How to choose between 12V and 24V air compressors
1. Voltage decides the power source, not the pressure
A 12V compressor clips to the car battery, a 24V inflator runs on a tool battery, and a cordless inflator runs on its own battery with a 12V cord as backup. The voltage tells you where the power comes from, not how hard it pumps — the 24V Greenworks reaches 160 PSI, but so does the 12V VIAIR 400P at 150 PSI.
2. Tyre size decides the compressor
The 88P and 300P are rated for tyres up to 33 inches, the 400P for tyres up to 35 inches, and the WOLFBOX for tyres up to 37 inches per WOLFBOX. Measure your tyres before you buy: a compressor rated below your tyre size will fill it slowly and overheat.
3. Airflow decides the fill time
The 400P and 300P deliver 2.30 CFM, the 88P delivers 1.47 CFM, and the WOLFBOX delivers 45 LPM. More airflow means a faster fill, and the difference shows on a 35-inch tyre: the 400P fills it in under 5 minutes, while the 88P takes longer and works harder.
4. Duty cycle decides how many tyres you can fill
The 400P and 300P run at a 33 percent duty cycle and need cool-down pauses, while the 88P runs for 25 minutes at 30 PSI. If you air down four tyres on a trail, you need a compressor that can fill all four without a long rest in between.
5. Cordless freedom has a battery cost
The Greenworks and the WOLFBOX inflate without starting the engine, but their batteries need charging and their runtime is limited. A 12V compressor runs as long as the engine runs. Buy cordless for top-offs, and buy 12V for long fills.
6. Automatic shut-off is worth having
The Greenworks and the WOLFBOX stop at the set pressure, while the VIAIR models need you to watch the gauge. Over-inflation damages a tyre, and a preset shut-off removes the risk. If you inflate at night or in a hurry, buy a model with shut-off.
12V and 24V air compressors by budget
| Tier | What you get | Example pick |
|---|---|---|
| Entry | Budget 12V compressor for cars and light trucks | VIAIR 88P |
| Mid | Mid-range 12V compressor or cordless 24V inflator | VIAIR 300P, Greenworks 24V |
| Heavy duty | Best 12V compressor or fastest cordless inflator | VIAIR 400P, WOLFBOX MegaFlow24 Pro |
Types of portable air compressors
| Type | Best for | Limit |
|---|---|---|
| 12V battery-clamp compressor | Clips to the car battery, fills big tyres | Needs the engine running; no shut-off on most models |
| 24V tool-battery inflator | Cordless top-offs, no engine needed | Needs the right tool batteries; not for big tyres |
| Cordless dual-power inflator | Battery with a 12V cord as backup | Battery runtime is limited; check the airflow figure |
| Cigarette-socket inflator | Plugs into the socket, cheapest | Limited to about 15 amps — too weak for truck tyres |
Detailed reviews: every pick, on maker evidence
Five compressors follow, in the order we would buy them for a roadside kit. Every figure comes from the maker documents or the Sources below, and every pick carries its own verified Amazon button, or a disclosed substitute.
Best Overall: VIAIR 400P
Best Overall
Why the VIAIR 400P is our pick
Because it is the 12V compressor that handles the biggest tyres: the VIAIR 400P is a 12-volt portable compressor with a maximum working pressure of 150 PSI, a free flow capacity of 2.30 CFM, and a 33 percent duty cycle at 100 PSI. It fills a 35-inch tyre from 0 to 30 PSI in under 5 minutes, or from 15 to 30 PSI in 2 minutes 45 seconds or less, and it runs for up to 15 continuous minutes at 150 PSI before needing 30 minutes to cool. The kit includes a 25-foot 5-in-1 inflator and deflator hose, battery clamps, and an IP54 rating against dust and water spray.
VIAIR 400P key specs
- Model: 40043
- Voltage: 12V DC, battery clamps
- Max pressure: 150 PSI
- Airflow: 2.30 CFM free flow
- Duty cycle: 33% at 100 PSI
- Max tire size: Up to 35 inches
- Fill time: 35-inch tire 0-30 PSI in under 5 minutes
- Hose: 25-foot 5-in-1 inflator/deflator hose
- Weight: 10.7 pounds
- Amp draw: 26 amps maximum
- Water rating: IP54, dust and water spray
- Buying channel: Verified Amazon listing, ASIN B000X9AXR8
VIAIR 400P: fits and best for
Best for trucks, SUVs and off-road vehicles with tyres up to 35 inches. Pair it with a tire inflator guide for the tyre checks and a 12V compressor guide for the recovery kit.
VIAIR 400P pros and watch-outs
Pros
- 2.30 CFM fills big tyres fast
- Rated for tyres up to 35 inches
- 25-foot hose reaches all four tyres
- IP54 dust and water spray rating
- Permanent magnetic motor, proven design
Watch-outs
- 33 percent duty cycle needs cool-down pauses
- Needs battery clamps — no cigarette socket
- 10.7 pounds is heavy for a glovebox
- No automatic shut-off on this model
VIAIR 400P: what owners report
Owners in the off-road roundups report the 400P as the compressor they keep coming back to, and they note it handles 35-inch mud tyres in about six minutes from empty to 30 PSI. The recurring caution is the duty cycle: it runs hard, then needs a rest before the next tyre. That limit is stated here, in the specs and in the FAQ.
VIAIR 400P: who should not buy
Skip it if your tyres are 33 inches or smaller — the 300P does the same job for less. Skip it if you need a cordless inflator; this one clips to the battery.
We may earn a commission at no cost to you.
Tip: Let it cool for 30 minutes after 15 minutes at full pressure — our compressor vs inflator guide covers the duty cycle that keeps it alive.
Best Budget: VIAIR 88P
Best Budget
Why the VIAIR 88P is our pick
Because it is the cheapest clamp-on compressor that still does the job: the VIAIR 88P is a 12-volt portable compressor with a maximum working pressure of 120 PSI and a free flow capacity of 1.47 CFM. It fills a 33-inch truck tyre from flat in under five minutes, and a 225/60R18 car tyre from 20 to 30 PSI in 50 seconds or less. It has a 25-minute duty cycle at 30 PSI, a 10-foot power cord with battery clamps, a 16-foot hose, and an IP53 rating. At 4.75 pounds it is the lightest compressor in this guide, and it draws around 20 amps under load.
VIAIR 88P key specs
- Model: 00088
- Voltage: 12V DC, battery clamps
- Max pressure: 120 PSI
- Airflow: 1.47 CFM free flow
- Duty cycle: 25 minutes at 30 PSI, per VIAIR
- Max tire size: Up to 33 inches
- Fill time: 225/60R18 tire 20-30 PSI in 50 seconds or less
- Hose: 16-foot hose
- Power cord: 10-foot cord with battery clamps
- Weight: 4.75 pounds
- Water rating: IP53, limited dust and water spray
- Buying channel: No verified Amazon listing — written alternative
VIAIR 88P: fits and best for
Best for cars, SUVs and light trucks with tyres up to 33 inches. Pair it with a tire inflator guide for the tyre checks and a 12V compressor reviews for the roadside kit.
VIAIR 88P pros and watch-outs
Pros
- Cheapest clamp-on compressor here
- Lightest at 4.75 pounds
- Fills a 33-inch tyre in under 5 minutes
- Battery clamps beat a cigarette socket
- LED work light and 120 PSI gauge included
Watch-outs
- 120 PSI is the lowest here
- No automatic shut-off — watch the gauge
- 16-foot hose is short for full-size trucks
- No verified Amazon listing — written alternative only
VIAIR 88P: what owners report
Owners in the 88P reviews report it as the 12V inflator most truck and overland drivers eventually buy and stop replacing, and they note the 1.47 CFM output is real. The recurring caution is the hose: 16 feet is workable on a sedan but tight on a full-size pickup. Availability was re-checked on 14 November 2026: the listing still shows no featured offers, so this pick is a written alternative.
VIAIR 88P: who should not buy
Skip it if your tyres are 35 inches or larger — step up to the 400P. Skip it if you need automatic shut-off; the 88P has none.
Written alternative: no verified Amazon listing for this compressor, so this pick has no direct buy button. The button below goes to the VIAIR 300P, the verified substitute — the same 12V clamp-on compressor with more airflow.
We may earn a commission at no cost to you.
Tip: Clamp it to the battery, not the cigarette socket — our compressor alternative guide covers the 20-amp draw that blows a socket fuse.
Best Mid-Range: VIAIR 300P
Best Mid-Range
Why the VIAIR 300P is our pick
Because it is the 400P for smaller tyres: the VIAIR 300P is a 12-volt portable compressor with a maximum working pressure of 150 PSI, a free flow capacity of 2.30 CFM, and a 33 percent duty cycle at 100 PSI — the same airflow and duty cycle as the 400P. It fills a 33-inch tyre from 15 to 30 PSI in about three minutes, with a 25-foot 5-in-1 hose, an 8-foot power cord with battery clamps, and a 30-amp maximum draw. At 8.7 pounds it is lighter than the 400P, and it runs for 30 minutes continuously at 30 PSI.
VIAIR 300P key specs
- Model: 30033
- Voltage: 12V DC, battery clamps
- Max pressure: 150 PSI
- Airflow: 2.30 CFM free flow
- Duty cycle: 33% at 100 PSI
- Max tire size: Up to 33 inches
- Fill time: 33-inch tire 15-30 PSI in about 3 minutes
- Hose: 25-foot 5-in-1 inflator/deflator hose
- Power cord: 8-foot cord with battery clamps
- Weight: 8.7 pounds
- Amp draw: 30 amps maximum
- Buying channel: Verified Amazon listing, ASIN B000X9B32M
VIAIR 300P: fits and best for
Best for trucks, Jeeps and SUVs with tyres up to 33 inches that air down on weekends. Pair it with a tire inflator guide for the tyre checks and a 12V compressor options for the off-road kit.
VIAIR 300P pros and watch-outs
Pros
- Same 150 PSI and 2.30 CFM as the 400P
- Lighter than the 400P at 8.7 pounds
- 25-foot hose reaches all four tyres
- 30 minutes continuous use at 30 PSI
- Proven for weekend air-down use
Watch-outs
- Rated to 33 inches, not 35
- 33 percent duty cycle needs cool-down pauses
- No automatic shut-off on this model
- Heavier than the cordless picks
VIAIR 300P: what owners report
Owners in the 300P reviews report it as the sweet spot of the VIAIR portable line, and they note it airs up two trucks in succession with a brief cool-down between them. The recurring caution is the duty cycle: about 20 minutes at 100 PSI, so long fills need pauses. That limit is stated here, in the specs and in the FAQ.
VIAIR 300P: who should not buy
Skip it if your tyres are 35 inches — the 400P is rated for those. Skip it if you want cordless; this one clips to the battery.
We may earn a commission at no cost to you.
Tip: Air up two tyres, then move the kit while it cools — our compressor vs air pump guide covers the cool-down that keeps it alive.
Best 24V: Greenworks 24V Cordless Tire Inflator
Best 24V
Why the Greenworks 24V Cordless Tire Inflator is our pick
Because it is the only compressor in this guide that actually runs on 24 volts: the Greenworks 24V cordless tire inflator, model INF24B210, works with a 24-volt rechargeable battery or a 12-volt vehicle outlet, so it inflates without starting the engine. It reaches 160 PSI, the highest maximum pressure here, with a digital pressure display, automatic shut-off, a built-in LED light and a 2.0Ah battery and 2A charger. It tops off a tyre from 28 to 35 PSI in under 2 minutes, weighs 4.9 pounds with the battery, and carries a 3-year tool and battery warranty.
Greenworks 24V Cordless Tire Inflator key specs
- Model: INF24B210 (also listed as ING401)
- Voltage: 24V battery or 12V vehicle outlet
- Max pressure: 160 PSI
- Airflow: Not published in the listing summary
- Duty cycle: Not published in the listing summary
- Max tire size: Not published in the listing summary
- Fill time: 28-35 PSI top-off in under 2 minutes
- Battery: 2.0Ah battery and 2A charger included
- Weight: 4.9 pounds with battery; 4.0 pounds bare
- Cord: 9-foot cord, stores in the base
- Warranty: 3-year limited tool warranty; 3-year battery warranty
- Buying channel: No verified Amazon listing — written alternative
Greenworks 24V Cordless Tire Inflator: fits and best for
Best for a car owner who already owns Greenworks 24V batteries and wants cordless top-offs. Pair it with a portable compressor guide and a battery guide.
Greenworks 24V Cordless Tire Inflator pros and watch-outs
Pros
- Only true 24V pick here
- Highest maximum pressure at 160 PSI
- Works without starting the engine
- Automatic shut-off and digital display
- 3-year tool and battery warranty
Watch-outs
- No airflow or duty cycle published
- Needs Greenworks 24V batteries
- Not for big truck tyres — a top-off tool
- No verified Amazon listing — written alternative only
Greenworks 24V Cordless Tire Inflator: what owners report
Owners in the Greenworks review report topping off two vehicles, two bicycles and a motorcycle in about 10 minutes, and they note the auto stop and the 12-volt option are the features that matter. The recurring caution is the battery system: it only takes Greenworks 24V batteries. No amazon.com listing could be verified, so it is a written alternative.
Greenworks 24V Cordless Tire Inflator: who should not buy
Skip it if you run 35-inch truck tyres — the VIAIR 400P is the tool for those. Skip it if you own no Greenworks 24V batteries; the battery is part of the cost.
Written alternative: no verified Amazon listing for this inflator, so this pick has no direct buy button. The button below goes to the WOLFBOX MegaFlow24 Pro, the verified substitute — a cordless inflator on battery or 12V power, not 24V.
We may earn a commission at no cost to you.
Tip: Keep a charged battery in the boot, not the inflator alone — our battery guide covers the battery care that keeps it ready.
Best Cordless: WOLFBOX MegaFlow24 Pro
Best Cordless
Why the WOLFBOX MegaFlow24 Pro is our pick
Because it is the third way in this comparison: the WOLFBOX MegaFlow24 Pro is a battery-powered dual-cylinder inflator, not a 24V unit — the 24 in the name is the model name, and it runs on a 12,000 mAh battery or a 12V DC input at 10 amps. It delivers 45 LPM of airflow at 150 PSI maximum pressure, with a 3.5-inch LED display, automatic shut-off, a 20-inch hose and an 11-foot 12V cord. On one charge it inflates up to 23 car tyres from 29 to 36 PSI, and it fills a car tyre from 29 to 36 PSI in 44 seconds. The manual lists 58 LPM for a later variant, which is noted here rather than hidden.
WOLFBOX MegaFlow24 Pro key specs
- Model: MegaFlow24 Pro
- Voltage: Battery powered / 12V DC (12V/10A input)
- Max pressure: 150 PSI
- Airflow: 45 LPM, per the listing; manual lists 58 LPM
- Battery: 12,000 mAh (44.4 Wh) lithium polymer
- Duty cycle: Not published in the listing summary
- Max tire size: Up to 37-inch tires, per WOLFBOX
- Fill time: Car tire 29-36 PSI in 44 seconds
- Hose: 20-inch hose; 11-foot 12V cord
- Weight: 4.85 pounds
- Display: 3.5-inch LED digital display
- Buying channel: Verified Amazon listing, ASIN B0DS5XTK7X
WOLFBOX MegaFlow24 Pro: fits and best for
Best for a driver who wants cordless inflation with a 12V cord as backup. Pair it with a portable compressor guide for the tyre checks and a 12V compressor reviews for the roadside kit.
WOLFBOX MegaFlow24 Pro pros and watch-outs
Pros
- Cordless with a 12V cord as backup
- Fastest fill here — 44 seconds for a car tyre
- Up to 23 car tyres per charge
- 3.5-inch LED display, easy to read
- Automatic shut-off included
Watch-outs
- The 24 in the name is not the voltage
- Airflow figure differs between listing and manual
- No duty cycle published
- Heavier than the Greenworks at 4.85 pounds
WOLFBOX MegaFlow24 Pro: what owners report
Owner coverage of the MegaFlow24 Pro specifically is thin — the roundups we found discuss the VIAIR models far more. That is stated here rather than filled in. The 45 LPM listing figure and the 58 LPM manual figure both come from WOLFBOX sources, and buyers should check the listing before ordering.
WOLFBOX MegaFlow24 Pro: who should not buy
Skip it if you want a true 24V inflator — the Greenworks is the only one here. Skip it if you need a published duty cycle before buying.
We may earn a commission at no cost to you.
Tip: Charge it by USB-C before a long trip — our 12V adapter guide covers the charging that keeps it ready.
Spec comparison
| Spec | VIAIR 400P | VIAIR 88P | VIAIR 300P | Greenworks 24V Cordless Tire Inflator | WOLFBOX MegaFlow24 Pro |
|---|---|---|---|---|---|
| Voltage | 12V DC | 12V DC | 12V DC | 24V / 12V | Battery / 12V DC |
| Max PSI | 150 PSI | 120 PSI | 150 PSI | 160 PSI | 150 PSI |
| Airflow | 2.30 CFM | 1.47 CFM | 2.30 CFM | Not published | 45 LPM |
| Duty cycle | 33% at 100 PSI | 25 min at 30 PSI | 33% at 100 PSI | Not published | Not published |
| Max tire size | Up to 35 in | Up to 33 in | Up to 33 in | Not published | Up to 37 in |
| Hose | 25 ft | 16 ft | 25 ft | Not published | 20 in |
| Power cord | Not published | 10 ft | 8 ft | 9 ft | 11 ft |
| Weight | 10.7 lb | 4.75 lb | 8.7 lb | 4.9 lb | 4.85 lb |
| Battery | None (12V) | None (12V) | None (12V) | 2.0Ah included | 12,000 mAh |
| Warranty | Not published | Not published | Not published | 3-year tool and battery | Not published |
| Check Price | Check Price | Check Price (substitute) | Check Price | Check Price (substitute) | Check Price |
Installation and use basics
Every compressor here follows the same order: connect, set, inflate, check. Connect the power — battery clamps to the battery, a tool battery to the inflator, or a charged cordless unit to nothing at all; set the target pressure on the gauge or display; inflate one tyre at a time; then check the pressure with a gauge. Never inflate a tyre you have not checked first.
For a battery-clamp compressor, clamp red to positive and black to negative, start the engine, and keep it running while you inflate. For a cordless inflator, check the battery before you leave — a dead battery is a flat tyre. Our 12V compressor guide covers the clamp order, and our battery guide covers the battery care that keeps a cordless unit ready.
Respect the duty cycle: the VIAIR models need cool-down pauses, and the cordless models need a charged battery. A emergency flashlight guide helps you see the valve in the dark, and a jump starter guide keeps the roadside kit straight. If a tyre will not hold air, the valve or the tyre is the problem, and our compressor vs inflator guide covers what to check.
Hand the car back as you found it: a 12V compressor reviews for the truck, a tire inflator guide for the car, a air compressor guide for the RV, and a portable compressor guide for the bike, with compressor brands guide and compressor options guide on the tyres and 12V adapter guide on the batteries. A 12V compressor reviews covers the compressor range, and our compressor reviews and cheap compressor guide guides cover the rest of the roadside kit.
Safety essentials
A compressor is a pressure tool — treat it like one, and never stand over a tyre while it inflates.
- Never exceed the tyre maximum pressure printed on the sidewall.
- Keep your face and body away from the tyre while it inflates.
- Let a 12V compressor cool down — a hot motor is a fire risk.
- Clamp red to positive and black to negative, every time.
- Never inflate a damaged, cracked or bulging tyre.
- Check the pressure with a gauge — do not trust your thumb.
Roadside recovery accessories for the kit bag
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Compressor will not start | Dead battery, or a blown fuse | Charge the battery and check the fuse and the clamps |
| Tyre fills very slowly | Wrong compressor for the tyre size | Step up to a higher-CFM compressor for big tyres |
| Compressor stops mid-fill | Duty cycle reached, or the motor overheated | Let it cool for 30 minutes, then resume |
| Pressure gauge reads wrong | Gauge damaged, or the hose is kinked | Straighten the hose and check with a separate gauge |
| Cordless inflator dies fast | Battery not charged, or the tyre is too big | Charge fully and use a 12V compressor for big tyres |
| Air leaks at the valve | Valve core loose, or the chuck not seated | Tighten the valve core and reseat the chuck |
Who should NOT buy these
You want one compressor for every vehicle. No single compressor covers a bicycle and a 35-inch truck tyre. The 88P covers cars, the 400P covers trucks, and the Greenworks covers top-offs. Buy the compressor for the tyres you own, and check our compressor brands guide for the rest.
You will not respect the duty cycle. The VIAIR models need cool-down pauses, and running them past the duty cycle burns the motor. If you will not pause, buy a cordless inflator with shut-off, and check our compressor options guide for the options.
You need to fill four 35-inch tyres without stopping. No portable compressor here does that in one run — the 400P needs a 30-minute cool-down after 15 minutes at full pressure. Fill two tyres, let it cool, and check our compressor vs air pump guide for the fill order.
You think 24V means more power. It does not: the 24V Greenworks reaches 160 PSI, but the 12V VIAIR 400P reaches 150 PSI with more airflow. Voltage is the power source, not the power, and our compressor vs inflator guide covers the difference.
Final verdict
VIAIR 400P — the best 12V pick: 150 PSI, 2.30 CFM, tyres up to 35 inches:
VIAIR 88P — the budget pick: 120 PSI, 1.47 CFM, tyres up to 33 inches, as a written alternative; buy the substitute on Amazon below:
VIAIR 300P — the mid-range pick: 150 PSI, 2.30 CFM, tyres up to 33 inches:
Greenworks 24V Cordless Tire Inflator — the only true 24V pick: 160 PSI on a tool battery or a 12V outlet, as a written alternative; buy the substitute on Amazon below:
WOLFBOX MegaFlow24 Pro — the cordless third way: battery-powered, 150 PSI, 12V cord backup:
FAQ
Is a 12V or a 24V air compressor better?
It depends on the tyres: a 12V compressor like the VIAIR 400P is better for truck tyres up to 35 inches, with 150 PSI and 2.30 CFM, while a 24V inflator like the Greenworks is better for cordless top-offs without starting the engine. Voltage is the power source, not the power.
Can a 12V compressor fill a 35-inch tyre?
Yes, if it is rated for it: the VIAIR 400P fills a 35-inch tyre from 0 to 30 PSI in under 5 minutes, at 150 PSI and 2.30 CFM. The 88P and 300P are rated to 33 inches only, so they will fill a 35-inch tyre slowly and overheat.
What does duty cycle mean on an air compressor?
It is the share of an hour the compressor can run before it must cool down: the VIAIR 400P and 300P run at a 33 percent duty cycle at 100 PSI, and the 400P needs 30 minutes to cool after 15 minutes at full pressure. Ignoring the duty cycle burns the motor.
Is the WOLFBOX MegaFlow24 Pro a 24V compressor?
No — the 24 in the name is the model name, not the voltage. It runs on a 12,000 mAh battery or a 12V DC input at 10 amps, at 150 PSI and 45 LPM. The Greenworks 24V is the only true 24V pick in this guide.
How long does a VIAIR 88P take to fill a tyre?
A 225/60R18 car tyre from 20 to 30 PSI in 50 seconds or less, and a 33-inch truck tyre from flat in under five minutes, at 120 PSI and 1.47 CFM. It is the slowest heavy-duty pick here, but it is also the lightest at 4.75 pounds.
Do I need a 24V battery for a 24V inflator?
Yes, for the Greenworks: it runs on a 24V Greenworks battery, or on a 12V vehicle outlet as a backup. It only takes Greenworks 24V batteries, so owners of other tool systems need to buy into the battery system as well.
Can I run a 12V compressor from a cigarette socket?
Usually not for a clamp-on compressor: the VIAIR 88P draws around 20 amps under load, which is more than a typical 15-amp cigarette socket fuse can sustain. Clamp it to the battery instead, and keep the engine running while you inflate.
What is the best cordless tire inflator?
For speed, the WOLFBOX MegaFlow24 Pro, which fills a car tyre from 29 to 36 PSI in 44 seconds at 150 PSI, with up to 23 car tyres per charge. For top-offs on a tool battery, the Greenworks 24V is the better buy, with automatic shut-off and a 3-year warranty.
How do I stop a compressor from overheating?
Respect the duty cycle: run the VIAIR 400P for up to 15 minutes at full pressure, then let it cool for 30 minutes. Fill two tyres, move the kit while it cools, and never run a compressor past its rated duty cycle.
Why are the VIAIR 88P and the Greenworks inflator written alternatives?
Because no Amazon listing for either product could be verified with a live offer: the VIAIR 88P listing showed no featured offers in three crawls, and no amazon.com listing for the Greenworks inflator could be found at all, in a fresh search on 14 November 2026. Each pick stays in the guide on its maker evidence, and its card and review carry a substitute button to the verified VIAIR 300P and the verified WOLFBOX MegaFlow24 Pro instead.
Sources
Maker documents
- VIAIR 300P instruction manual (150 PSI, 33 percent duty cycle, 2.30 CFM, 8.7 pounds, 25-foot hose)
- Greenworks 24V cordless inflator official page (160 PSI, dual power, 2Ah battery, model INF24B210)
- WOLFBOX MegaFlow24 Pro official page (45 LPM, 12,000 mAh battery, 150 PSI, 37-inch tyres)
- WOLFBOX MegaFlow24 Pro user manual (58 LPM, 12,000 mAh, 150 PSI, 12V DC input, 20-inch hose)
- Greenworks 24V cordless inflator manual (model ING401, 160 PSI, 24V battery or 12V outlet)
- Shopabunda VIAIR 400P listing data (150 PSI, 33 percent duty cycle, 2.3 CFM, 35-inch tyres)
Listing evidence
Owner reports
- Power Air Compressors VIAIR 400P review (150 PSI, 33 percent duty cycle, 2.3 CFM, 35-inch tyres, IP54)
- Peggy Omara best portable air compressors for off-roading (400P 2.30 CFM, 25-foot hose, 10.7 pounds)
- The Tested Hub VIAIR 88P review (1.47 CFM, 120 PSI, 30-minute duty cycle, 16-foot hose, 33-inch tyre in under 5 minutes)
- Trail4Runner VIAIR 88P review (120 PSI, 25-minute duty cycle, 1.47 CFM, IP53, 4.75 pounds)
- Pro Tool Reviews Greenworks 24V inflator review (160 PSI, 28-35 PSI in under 2 minutes, 3-year warranty, 4.9 pounds)
- Getaway Couple VIAIR 300P vs 400P (both 150 PSI, 33 percent duty cycle, 25-foot hose, 8-foot cord)
By Leo, Founder, WinchInsider
Leo researches automotive tools and recovery gear from maker documents, listing evidence and owner reports — never from press releases — and publishes the exclusions alongside the picks.