These caps fit the E-sync Centerlock hubs with a rare thru-axle spacing (for example: DT RWS), and Shimano HG or SRAM XD/XDR cassettes. The cap on the non-motorised side includes a low-friction U-seal that locks in place and stays securely in position even when your wheel is removed from your bike. Compatible with the E-sync Centerlock hubs, Neo, and Neo Ultimate of 10x135mm with thru-axle and Shimano HG or SRAM XD/XDR freehubs. Not compatible with traditional 135mm hubs with quick-release. Not compatible with 6-bolt hubs. Not compatible with E-sync and Neo hubs of 142mm, 148mm, 157mm, or single-speed. Not compatible with Shimano Micro Spline hubs. Not compatible with M-pulse hubs.