Convert you front caliper mount to 180mm. Designed for BR-M985 and BR-M988, but can be used on all Shimano 74mm caliper brakes.
Shimano PM 180mm MTB Disc Brake Rotor Caliper Bike Mount Adapter Front Rear
Shimano Disc Brake Adapter, Front/Rear, SM-MA-F220P/PM - 180mm PM - 220mm Rotor
140/160/180mm Bike Brake IS/PM Adapter MTB Road Mountain Bicycle for Shimano UK
Bike Brake IS/PM Adapter MTB Road Mountain Bicycle 140/160/180mm for Shimano UK
BUCKLOS IS/PM 180mm 203mm Post Mount Rotor MTB Bike Disc Brake Caliper Adapter
