Shimano post mount disc brake adapters allow you to run your preferred rotor size. Details: Material: Aluminum Mounting hardware included Model No: SM-MA-F180P/P2 Size: +20mm Lifts your brake caliper 20mm Example: 180mm post mount fork, 200mm rotor Model No: SM-MA-F203P/PM Size: +23mm Lifts your brake caliper 23mm Example: 180mm post mount fork, 203mm rotor Model No: SM-MA-F220P/PM Size: +40mm Lifts your brake caliper 40mm Example: 180mm post mount fork, 220mm rotor Model No: SM-MA-F203P/P Size: +43mm Lifts your brake caliper 43mm Example: 160mm post mount fork, 203mm rotor Compatibility: Standard post mount brake calipers Post mount forks