Replacement driveside endcap for HUP RCG24/28 and XTA28 hubs, required when using the Shimano Microspline freehub.
Maintenance is simple with press fit end caps and slide-off freehubs, servicing or converting from HG to XDR/Microspline is tool-free and takes seconds.
*subject to manufacturing tolerance +/- 3%. More installation details HERE