When it's time to refresh your trusty wheelset, Bontrager genuine replacement parts have you covered. Details: Sold in packs of three for easy upgrades to 108-tooth engagement Use 3 pawls/springs for 54-tooth engagement Use 6 pawls/springs for 108 tooth engagement Bontrager Rapid Drive 108 Freehub Spring Kit sold separately Compatibility: Freehub: Bontrager Rapid Drive 108 Freehubs : Shimano HG, Shimano Micro Spline, SRAM XD Springs: Bontrager Rapid Drive 108 Freehub Spring Kit