Upgrade or refresh your Bontrager wheels. Upgrade or refresh your Bontrager wheels. Genuine replacement parts Genuine replacement parts When it's time to refresh your trusty wheelset, Trek Genuine Replacement Parts have got you covered. When it's time to refresh your trusty wheelset, Trek Genuine Replacement Parts have you covered. - End cap for Bontrager Rapid Drive 108 hubs End cap for Bontrager Rapid Drive 108 hubs - For use with Shimano MICRO SPLINE freehub For use with Shimano MICRO SPLINE freehub - Sold individually Sold individually