How we researched this guide
We compared 5 brake pad options and checked 6 maker and owner sources before writing. The baseline pad is the Shimano L03A resin pad for road disc brakes, and every alternative here is checked against Shimano’s own compatibility chart.
We did not test any product hands-on. Maker claims are written as rated or stated by the maker, and owner experience is paraphrased from the linked sources.
The 30-second answer
Buy the Shimano L05A-RF if you want the direct current replacement for the L03A: same resin feel, same finned shape, with Shimano rating it for 50 percent better wear resistance than the L03A. Choose the Shimano L04C metal pad for long descents and wet winter miles, the finless Shimano K03S to save money, and the SwissStop Disc 34 EXOTherm2 if you want a third-party pad owners rate above the original.
Quick picks
Direct replacement
Shimano L05A-RF Resin Disc Brake Pads
Best if you want the current genuine pad. Same resin compound family as the L03A, finned alloy back, and Shimano’s official replacement.
Best for descents
Shimano L04C-MF Metal Disc Brake Pads
Best if you ride long descents or gritty winter miles. Sintered metal lasts longer and resists fade, at the cost of more noise.
No verified Amazon listing was found for this exact pad in our research, so there is no button here. Buy it from an authorized Shimano retailer.
Budget genuine
Shimano K03S Resin Disc Brake Pads
Best if you want genuine Shimano resin pads for less. Finless version of the same pad shape, fully interchangeable in the same calipers.
No verified Amazon listing was found for this exact pad in our research, so there is no button here. Buy it from an authorized Shimano retailer.
Best third-party
SwissStop Disc 34 EXOTherm2
Best if you want an aftermarket upgrade. Owners report quiet running, strong power, and no fade on long steep descents after bed-in.
No verified Amazon listing was found for this exact pad in our research, so there is no button here. Buy it from a bike shop or authorized dealer.
We may earn a commission at no cost to you. See our affiliate disclosure.
Quick compare
| Pad | Compound | Fins | Best for | Button |
|---|---|---|---|---|
| Shimano L05A-RF | Resin | Yes | Direct L03A replacement | Check Price |
| Shimano L04C-MF | Metal | Yes | Descents, wet miles | Retailer only |
| Shimano K03S | Resin | No | Budget genuine | Retailer only |
| SwissStop EXOTherm2 | Hybrid resin | Yes | Aftermarket upgrade | Retailer only |
How to choose an L03A alternative
Match the pad shape first
All of these pads are the narrow L-type or K-type shape for two-piston flat-mount road calipers, including Dura-Ace BR-R9170 and BR-R9270, Ultegra BR-R8070 and BR-R8170, 105 BR-R7070, Tiagra BR-4770, and GRX BR-RX810 and BR-RX400. G-type pads fit older calipers and do not fit these brakes, so check the caliper model stamped on your brake before ordering.
Resin for most road riding
Resin pads bite quickly when cold, run quiet, and modulate well, which is how most road riding actually happens. Shimano rates its resin pads higher than metal for modulation and silence. Their weakness is faster wear and less power on very long, wet descents.
Metal for heat and durability
Sintered metal pads last longer, handle heat better, and keep power on sustained descents. They are noisier, slower to bite when cold, and pass more heat into the caliper. Pick metal if you are a heavier rider, ride alpine descents, or train through winter grit.
Finned or finless
Finned L-type pads carry radiator fins that shed heat off the pad. Finless K-type pads are the same shape and fit the same calipers, and cost less. Fins matter most on sustained descents and cost little extra, so they are the default choice unless budget is tight.
Buy genuine pads from authorized sellers
Shimano warns that counterfeit disc brake pads are sold on online marketplaces and can be hard to tell from genuine ones by looks alone. One reviewer bought convincing fake L05A-RF pads whose braking surface failed on a ride. Buy from an authorized retailer, and be suspicious of listings far below the normal range.
Shimano L05A-RF: the direct replacement
The L05A-RF is Shimano’s official replacement for the L03A, and several retailers now describe the L03A as discontinued. It uses Shimano’s fifth-generation resin compound, which Shimano rates for 50 percent better wear resistance than the L03A, with the same alloy radiator fins and the same fitment across Dura-Ace, Ultegra, 105, Tiagra, and GRX disc brakes. Owners who switched report the same quiet, controllable feel as the original, with easy bed-in and good life. If your L03A pads are worn and you liked them, this is the no-decision answer.
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Shimano L04C-MF: the metal alternative
The L04C-MF is Shimano’s metal version of the same finned pad. Sintered metal trades the resin pad’s silence and cold bite for durability, power, and fade resistance. Owner consensus from forums is that metal pads brake worse than resin when cold, which is the normal state on most rides, so metal is a specialist choice rather than a straight upgrade. Pick it for long descents, heavy loads, or wet winter training, and accept the extra noise.
Shimano K03S: the budget genuine pad
The K03S is the finless resin sibling of the L03A. K-type and L-type pads are fully interchangeable in the same calipers; the only difference is the cooling fins. You give up some heat shedding on long descents and save money, which suits flat and rolling riding in dry conditions. It is the sensible pick if you replace pads often and ride mostly in fair weather.
SwissStop Disc 34 EXOTherm2: the third-party upgrade
SwissStop’s Disc 34 EXOTherm2 is a hybrid-resin pad with an aluminum backing plate and integrated cooling fins, made to fit the same Shimano road calipers as the L03A. Owners who replaced worn L03A pads with it report a step above the original after bed-in: quiet running, strong power, smooth modulation, no fade on long steep descents, and equal wet and dry performance, with one owner reporting 1,500 miles on a set. It costs more than the genuine Shimano pad, so it suits riders who want the best feel rather than the lowest cost.
Spec comparison
| Pad | Compound | Back plate | Fins | Fitment |
|---|---|---|---|---|
| L05A-RF | Resin, 5th gen | Alloy | Yes | Road flat-mount 2-piston |
| L04C-MF | Metal | Stainless, alloy | Yes | Road flat-mount 2-piston |
| K03S | Resin | Not published | No | Road flat-mount 2-piston |
| EXOTherm2 | Hybrid resin | Aluminum | Yes | Road flat-mount 2-piston |
Bedding in new pads
Bedding in is mandatory, not optional. Owner and maker sources agree that a proper bed-in extends pad life several times over. The usual method is a series of firm stops from moderate speed without coming to a full stop, letting the pads cool between runs, until braking feels consistent. Never drag the brakes continuously while bedding in, and clean the rotor with brake cleaner before fitting new pads if the old ones were glazed or contaminated.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Squealing | Glazed or contaminated pads | Clean rotor, sand pads lightly, re-bed |
| Weak braking | Wrong compound or worn pads | Check pad thickness, fit correct compound |
| Fade on descents | Overheated resin pads | Switch to finned or metal pads |
| Pads wear fast | Grit, wet riding, dragging brakes | Clean rotors, avoid dragging, try metal |
| Pads do not fit | Wrong pad family | Confirm L-type or K-type shape first |
Who should NOT buy these
Mountain bike riders with four-piston brakes: these pads fit two-piston road and gravel calipers only. Four-piston calipers use a different pad shape entirely.
Riders who want the cheapest pads available: unbranded bargain pads have failed in testing, with one set melting off its backing plate. Saving a few dollars on the part that stops your bike is a poor trade.
Final verdict
Most riders should buy the Shimano L05A-RF: it is the current genuine pad, it fits, and it lasts longer than the L03A it replaces. Heavy riders and descent specialists should look at the L04C metal pad, and riders who want the best feel should try the SwissStop EXOTherm2.
Frequently Asked Questions
Is the Shimano L03A discontinued?
Several retailers describe the L03A as discontinued, with the L05A-RF as its official replacement. Shimano still lists both pads on its compatibility chart, so old stock remains, but the L05A is the current pad to buy.
Do L03A and L05A pads fit the same brakes?
Yes. Both are the narrow L-type shape for two-piston flat-mount road calipers, including Dura-Ace, Ultegra, 105, Tiagra, and GRX. The finless K03S also fits the same calipers.
Are resin or metal pads better for road bikes?
Resin suits most road riding: quieter, better cold bite, better modulation. Metal suits long descents, heavy riders, and wet winter miles, where durability and fade resistance matter more than silence.
What is the difference between finned and finless pads?
Finned pads carry radiator fins that shed heat during hard braking. Finless pads are the same shape and fit the same calipers but run hotter on sustained descents. Fins cost little extra and are worth having.
Can I use SwissStop pads with Shimano rotors?
Yes. SwissStop Disc 34 pads are made for Shimano road calipers and work with Shimano rotors, though SwissStop says its pads work best with its own rotors. Always bed new pads in properly.
How do I spot fake Shimano brake pads?
Shimano warns that counterfeits are hard to tell from genuine pads by looks alone. Buy from authorized retailers and be wary of listings far below the normal range. Packaging and stamps alone do not prove a pad is genuine.
Do I need to bed in new brake pads?
Yes. A proper bed-in is needed for full braking power and long pad life. Do a series of firm stops from moderate speed, let the pads cool between runs, and do not drag the brakes continuously.
How long do resin pads last?
Life depends on riding conditions, rider weight, and braking habits. Shimano rates the L05A resin compound for 50 percent better wear resistance than the L03A, and owners report good life in dry road use with faster wear in wet, gritty conditions.
Sources & changelog
Manufacturer and maker sources:
- Shimano compatibility chart C-192
- Shimano L05A-RF product page, BikeTiresDirect
- SwissStop Disc 34 EXOTherm2 review, bikeboard.cc
- Best disc brake pads 2026, Cyclist
- Best disc brake pads for road and gravel 2026, Cycling Weekly
- Shimano disc brake pads recommendations, TrainerRoad forum
- Shimano counterfeit disc brake pad notice
Changelog — November 5, 2026: guide first published. One Amazon button is included, for the Shimano L05A-RF. No verified Amazon listing was found for the L04C, K03S, or SwissStop pads, so those are named without buttons rather than linked to unverified listings.
By Leo, Founder, WinchInsider
Leo writes WinchInsider guides from maker specifications, manuals, and owner reports, so readers can choose workshop tools with facts instead of guesses.