e*thirteen TRS Plus Cassette - 12 Speed 9-46t Black For XD Driver Body. The TRS Plus Cassette offers impressive range and crisp shifting performance on both SRAM and Shimano drivetrains. Using a unique two-piece individually replaceable assembly and a 9t cog the TRS provides superior ground clearance in a compact package so you can clean steeper climbs. More range more fun same standard.