Shimano SM-MA-F180P/S Disc Brake Adapter, Front, Post Mount to IS Fork, 180mm

Available from Good Weather Bicycle when we last checked. Sold from the shop’s own store; the price there is the one that counts.

Small bracket, big difference. Bolts a post mount caliper onto an IS tab fork and steps you up to a 180mm rotor, which is the cheapest braking upgrade there is if you ride loaded or ride steep. Front, 74mm post mount caliper to 51mm IS fork, for a 180mm rotor. Bolts included. Part SM-MA-F180P/S. Bring the fork or a photo of the tabs if you're not sure what you've got, we'll figure it out together.