These cassettes are for those with an XD Driver

Compatible with rims up to the 50mm deep

You will have to use the old thumb test

The allows for a 40% increase in capacity

Other component compatibility: It should work on all 12 speed systems

Leatt 3DF Airfit Lite Shoulder Protection Tee - M - Black Heavy/Bulky These cassettes are for thoseIf you are looking for non bulky shoulder protection to work in conjunction with a hardshell chest protector look no further. The Shoulder Tee is designed to be used as a moisture wicking base layer but has the benefit of CE Certified slimline soft impact foam in the shoulders that works with or without a Leatt Neck Brace. Total Leatt protection score of 5 points 3DF AirFit ventilated soft impact foam CE tested and certified as impact protection: