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Universal Cycles -- Shimano XTR MA90 Disc Brake Adapters [ISMMA90F160PS, ISMMA90F180PPC, ISMMA90R140PS, ISMMA90R160PS, ISMMA90R180PS]
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Shimano SM-MA90 Mountain Bike Rear Disc Brake Mount Adapter EIEIO Frame Fork P/S Conversion Seat 140/180mm Bicycle Parts - AliExpress
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Shimano XTR R180P/S Disc Brake Adaptor for 180mm Rotor 74mm Caliper 51mm Frame | Propel Electric Bikes
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