The Shimano SM-MA-R160D/D Disc Brake Adaptor makes it easy and affordable to equip a rear 160mm rotor on a 140mm rotor native frame. This small part works for road and gravel bikes and opens up new options for riders who want to use a larger rotor. It comes with mounting hardware so you can get your new spec up and moving as quickly as possible. With this adapter, you have everything you need to gain the extra clearance for the flat mount disc brake standard.