The Shimano SM-RA-R160 disc brake mount adaptor allows a 74mm rear post-type caliper to bolt to a chainstay with 51mm bolt width that takes a 160mm rotor.

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SM-MA-R160 Disc Brake Mount Adaptor - Rear

REI Co-Op

SM-MA-R160 Disc Brake Mount Adaptor - Rear

From Shimano

REI Co-Op

SM-MA-R160 Disc Brake Mount Adaptor - Rear

From Shimano

Color: None

Size: Rear

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