These caps fit E-sync hubs with a rare 10x135mm through-axle spacing (for example: DT RWS), and Shimano HG or SRAM XD/XDR cassettes. The non-drivetrain end cap includes a low-friction U-seal that clips into place and stays secure even when your wheel is removed from your bike. Compatible with E-sync, Neo, and Neo Ultimate hubs with 6 bolts 10x135mm and Shimano HG or SRAM XD/XDR freehubs. Not compatible with traditional 135mm hubs with quick-release skewers. Not compatible with Centerlock 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.