They are fitted with EXCESS XLS double-wall aluminum 6061-T6 rims with 2 specific profiles as well as sealed EXCESS XLS hubs fitted with a 3-pawl engagement system on 24 teeth offering you effective engagement when relaunching or exiting. wire rack. Ready to use for V-Brake braking, The rear hub also offers the possibility of converting it for use with a disc brake with its CenterLock system.