RockShox 20mm thru-axlesCompatible with 2006+ year model forks. The dropouts must be solid and threaded on the LH side to use this axleFor older Boxxers with a pinch-bolt type drop out: RockShox has discontinued production of the old-style axle. A workable, albeit expensive, solution is to replace the lower legs with the new version, FK7275 (includes DH Maxle)Item SpecificationsUnit of SaleEachFitsNew 35mm BoXXer