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Front Rear Brake Caliper Base Adapter | Bicycle Disc Brake Adapter - New 160mm 180mm - Aliexpress
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Shimano Adapter for Flat Mount Caliper to Road
Shimano SM-MA F180P/P2 Disc Brake Adapter - 160 To 180mm / 140 To 160m – The PM Cycles
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How to Fit 180mm Brake Rotors on Flat-Mount Frames/Forks - BIKEPACKING.com