The Shimano SM-MA90-F203P/PM adapter lets you run a 203 mm rotor on a fork or frame with 180 mm post mounts.

What it's for

Use it to step up from a 180 mm to a 203 mm rotor for more braking power.

Compatibility

• How to check yours: confirm your fork or frame is rated for a 203 mm rotor and that its native post mount size is 180 mm

Specs

• Rotor: 203 mm
• Mount: 180 mm post mount
• Caliper: post mount
• Model: SM-MA90-F203P/PM