SHIMANO SM-MA-F180P/P2 Disc Brake Adaptor - For 180mm Disc Brake Rotor, 74mm Caliper, 74mm Frame/Fork Compatio_enriched the Arch S1 is made

the Arch S1 is made for maximum durability

Lighter front shifting operation

Brake Caliper: BR-M7120 4-piston

This mount with extended arm allows you to stay in a comfortable heads-up position for easier monitoring and improved safety

Compatible with Shimano rear derailleurs

SHIMANO SM-MA-F180P/P2 Disc Brake Adaptor - For 180mm Disc Brake Rotor, 74mm Caliper, 74mm Frame/Fork Compatio_enriched the Arch S1 is madeShimano Disc Brake Adaptors allow the use of different sized rotors to your frame or fork. Allows 140mm Post Mount forks and frames to use 160mm disc brake rotor Allows 160mm Post Mount forks and frames to use 180mm disc brake rotor Includes mounting hardware