SMHB20 / HMB618 Centre-Lock Ring for Disc Rotors to fit around 15/20mm front bolt through axles
Allows 15mm and 20mm thru axles to be used on hubs with Shimano centre-lock disc rotor attachment. SM-HB20 / HMB618
Also fits over the QR and 12mm front caps on the Hunt Carbon and Aero Light Disc Wheelsets.
Replaces the standard centre-lock ring.
Use Slim version for narrow clearance forks.