E thirteen trs plusthe trs cassette is all about range using a unique 3 piece assembly the trs cassette offers 9t to 44t 11 speed or 42t 10 speed range the largest two 10 speed or three 11 speed cogs are precision machined from aluminium and locked onto a sram xd driver body the remaining eight steel cogs lock into place with a chain whip the front cogs are shared on the 10 and 11 speed versions and high wear parts are available individually which means replacing worn parts or up