Resin Only Rotors: Can You Use Sintered Brake Pads on Them?

Quick answer: no. If your disc rotor is marked "RESIN PAD ONLY", choose pads explicitly approved for use with that rotor, such as a compatible resin (organic) pad. Sintered metal pads can damage a resin only rotor. To switch to sintered pads, both your rotor and your brake caliper must support them.

Before ordering replacement pads, check two things: the pad shape your caliper takes and the compounds your rotor allows. A pad can fit perfectly inside the brake and still be the wrong choice for the rotor.

What does "resin pad only" mean?

The marking tells you which pad compound the rotor is designed to work with. It refers to the friction material on the brake pad, not the material the rotor is made from.

Resin only rotors are common on everyday, commuter and entry level mountain bikes. Used with the correct pads, they can be a perfectly suitable part of the braking system. The restriction matters when you change compound: Shimano warns that metal pads can damage these rotors.

You do not need to replace a sound, compatible rotor simply because it is resin only. If your brakes suit your riding, replacing worn pads with the correct resin compound is a straightforward option.

How to check whether your rotor is resin only

1. Read the marking. With the bike stationary and the brakes cool, look for "RESIN PAD ONLY" on the rotor. Keep oil and grease away from the braking surface.
2. Find the model number. Look for a code such as SM-RT54 or RT-CL300. Check both wheels, as the front and rear rotors may differ.
3. Confirm the manufacturer's specification. An unreadable label does not establish compatibility. Identify the exact rotor before changing pad compound; if you cannot identify it, ask for help.

Which Shimano rotors are resin only?

Shimano's disc brake caliper and rotor compatibility chart identifies the following models as resin only:

• SM-RT10
• SM-RT26
• SM-RT30
• SM-RT54
• SM-RT56
• RT-CL300
• RT-EM300

These are examples from Shimano's chart, not a complete list of every resin only rotor ever sold. Always check your exact model.

Check the caliper as well as the rotor

Some calipers are specified for resin pads too. Shimano lists models including BR-MT200, BR-MT400, BR-MT500 and BR-M4050 in its resin pad group. Changing the rotor alone does not make those brakes suitable for metal pads.

Shimano models such as SM-RT64, SM-RT66 and SM-RT86 support both metal and resin pads, but they are not universal replacements. Rotor diameter, thickness, mounting type and braking track width must also suit the brake and bike. Check the complete combination before buying.

What if you have already fitted sintered pads?

If you discover sintered pads on a resin only rotor, correct the mismatch before riding again. Fitting resin pads does not undo any wear or damage that has already occurred.

• Inspect the rotor. Check for cracks, deformation and wear, and compare its thickness with the limit marked on the rotor or specified in its manual.
• Replace an unsafe rotor. Do not use one at or below its specified wear limit, or one that is cracked or damaged. If its condition is uncertain, have a qualified cycle mechanic inspect it.
• Fit an approved combination. Use the correct resin pads with a serviceable resin only rotor, or choose a fully compatible rotor and brake setup for the compound you want.

Follow the instructions for your particular brake system. For example, Shimano's hydraulic disc brake user manual explains rotor inspection and replacement criteria; wear limits should not be assumed to be identical across all rotor models.

Which pads should you choose for a resin only rotor?

Start with the correct pad shape, then choose a compound approved for your rotor and suitable for your riding conditions. From the Gorilla Brakes range:

• Enduro Pro Power: our new light green, steel backed compound delivers strong, immediate bite from cold and a consistent, predictable braking response as heat builds. Gorilla Brakes approves Power for use with rotors marked "resin pads only". Choose the version that matches your exact caliper.
• Enduro Pro Resin: a resin option focused on smooth modulation, quiet braking and pad life for everyday riding, trail, road and gravel use.
• Factory Racing Organic: a soft organic compound for strong initial bite and quiet braking in dry conditions. It prioritises feel over longevity and is not our recommendation for wet, muddy or winter riding because wear can be very fast.

Enduro Pro Power fitment: the current range covers Shimano four piston D / H / N Type, Shimano L / K Type and SRAM Large pad shapes. There is currently no Shimano B type Power pad for brakes such as BR-MT200. Rotor compatibility and pad fit are separate checks.

Select the version listed for your caliper and check the product's compatibility information. Use the Gorilla Brakes pad finder to identify the pad shape, then check your rotor's compound restriction separately. You can also browse our Shimano brake pads.

Want to switch to sintered pads?

Sintered pads can offer longer pad life in wet, muddy conditions, as Shimano's guide to metal and resin pads explains. Make the change only when the whole setup is compatible:

1. Confirm the caliper accepts metal pads. Check the exact brake model, not just the pad shape.
2. Choose a suitable metal compatible rotor. Match the hub's six bolt or Center Lock mounting, rotor thickness, braking track width and diameter. Follow the frame, fork, caliper and adapter requirements.
3. Fit the correct pads. Choose sintered pads listed for your caliper and follow the fitting instructions.
4. Bed in the combination. Follow the brake and pad manufacturer's procedure before demanding riding. Our bedding in guide explains the process.

If your current brake is resin only, staying with a suitable resin compound is often the simplest choice. Our sintered vs resin guide and compound comparison can help you compare the options.

Frequently asked questions

Can I use sintered pads on resin only rotors just for winter?

No. The compound restriction applies throughout the year. Choose an appropriate resin pad, or check that both the caliper and replacement rotor support a move to sintered pads.

Are semi metallic or ceramic pads safe on resin only rotors?

Do not assume compatibility from the name. Compound descriptions vary between manufacturers, and a resin bound pad is not automatically suitable for every resin only rotor. Check the specific pad and rotor guidance, including any caliper restrictions. If compatibility is unclear, ask before fitting.

Can I use resin pads on a rotor that accepts metal pads?

Yes, where that rotor is specified for both resin and metal pads. Check its specification and the caliper's requirements rather than assuming every rotor accepts every compound.

Are organic and resin pads the same thing?

The terms usually describe resin bound friction materials, but the recipes and intended uses differ. Choose the exact compound for your brake, rotor and conditions, rather than relying on the label alone.

Can I keep using resin pads in wet weather?

A resin only rotor does not automatically need replacing for winter. Choose a resin pad suited to the conditions and inspect it regularly. Our Factory Racing Organic compound is intended for dry use; do not treat every organic or resin pad as having the same wet weather suitability.

What if I still cannot identify my rotor or pads?

Contact Gorilla Brakes with the brake model and clear photos of the rotor markings and existing pads. We can help you work out the correct pad shape and compound before you order.