Brembo GR-PRO +40 mm Brake Caliper Adapter

Genuine Brembo GR-PRO caliper mount adapter, part 920F45311. Positions the caliper for a rotor 40 mm larger in diameter than the original frame or fork mount size.

+40 mm refers to the increase in rotor diameter, not the distance the caliper moves.

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Brake adapters & mounting hardware

Specifications

Brand / system: Brembo GR-PRO
Part number: 920F45311
Rotor diameter increase: +40 mm
Position: Compatible frame or fork mounting applications

Choosing your adapter

Choose +40 mm using the original frame or fork mount size.
Example size changes: 160 → 200 mm; 180 → 220 mm.
Match the complete brake, mount and rotor combination.

Check the fit before ordering

Check the original mount size, target rotor diameter and frame or fork maximum. The rotor currently fitted may already use an adapter and does not establish the mount’s original size. Use the specified mounting hardware and follow the brake, frame and fork instructions.

Frequently asked questions

What does +40 mm mean?

It means the intended rotor diameter is 40 mm greater than the original frame or fork mount size. It is not the physical amount the caliper moves.

Which rotor size changes does this adapter cover?

Examples relative to the original mount size are 160 → 200 mm; 180 → 220 mm. These are size calculations, not a guarantee for every frame, fork or brake.

Does it fit every brake caliper?

No. This is a Brembo GR-PRO adapter. Confirm the exact brake and mounting arrangement before ordering.

Can I choose it from my current rotor size?

Not by that alone. Identify the original frame or fork mount size, any adapter already fitted and the target rotor diameter.

Need help choosing?

Send us your brake model, frame or fork mount details and intended rotor size. We can help you identify the correct option.

Contact & support All brake adapters & mounting hardware Disc brake rotors

Adapter / mounting references

Part / model reference: 920F45311
Fitting / application: Brembo GR-PRO caliper
Rotor diameter increase: +40 mm

For Brembo GR-PRO calipers. The increase is relative to the original frame or fork mount’s rotor size, not necessarily the rotor currently fitted. Check the mount and maximum permitted rotor diameter.

Manufacturer / supplier information

88%

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Total pad thickness is less than OEM Magura MT7 brakes. This causes too much freeplay in stoke.

Hi Mike, thanks for sharing your feedback. Our brake pads and the corresponding Magura OEM pads are both 4 mm thick, and ours are manufactured to the same specifications.

Could you please contact us so we can check that you’ve ordered the correct pads for your brakes? We can send you side-by-side photos today showing our pads alongside the matching Magura OEM pads to help confirm the fitment. Also brakes self adjust thats what the master cylinder is for so even if they were thinner its would not make a difference to lever feel or free stroke your more than welcome to pop in and we can check the brakes for you. free of charge.

Great brake pads; bought to replace a proprietary set of pads which were squealing like a stuck pig. These are totally silent - my friends have now been able to remove their earplugs and we’re now back to discussing our usual rubbish! Success 👌

Thanks, Guy! Great to hear your Shimano-compatible Factory Racing STEALTH disc brake pads have quietened things down and brought the ride chat back! We're glad the switch has worked so well for you. Thanks for choosing Gorilla Brakes, and happy riding to you and the group! 👌

Really impressed with how the brakes now feel with these pads , alot more responsive and powerful.

Thanks, Paul! It's great to hear our Enduro Pro Ultimate disc brake pads have made your braking feel more responsive and powerful. We really appreciate you sharing your experience and choosing Gorilla Brakes. Enjoy the rides ahead!

Bisher meine besten Pads. Super grip, ach bei Regen und stärker Verschmutzung. Absolut empfehlenswert.

Hallo Manfred, vielen Dank für die tolle Bewertung! Schön zu hören, dass du mit dem Grip der Bremsbeläge auch bei Regen und stärkerer Verschmutzung so zufrieden bist. Danke für deine Empfehlung!

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Brembo GR-PRO +40 mm Brake Caliper Adapter