This Shimano adapter mounts a post mount caliper to an IS mount frame for use with a 203 mm rotor.

What it's for

Use it when your frame has an IS (International Standard) rear brake mount and you want to run a 203 mm rotor with a post mount caliper.

Compatibility

• How to check yours: IS mounts have two unthreaded holes 51 mm apart that face sideways. Post mounts have two threaded holes 74 mm apart that face the caliper

Specs

• Rotor: 203 mm
• Caliper: post mount, 74 mm
• Frame: IS mount, 51 mm
• Position: rear