Marc Willers Caroline Buchanan Kurt Pickard the Dutch National BMX team & many other of the worlds top elite & amateur racers have been winning on BOX 20-Millimeter Freewheel Hubs for more than two years including a World Championship & three medals this year in New Zealand Their more reliable & weigh less than many cassette hubs & most importantly have 20-millimeter axles Our race-proven 20-mil axles help transmit more power from the pedals to the wheels propelling the rider forward faster & straighter Hollow Hubs feature cold forged & CNC-machined 6061-T6 aluminum shells fitted with precision sealed bearings & 20-millimeter 7075-aluminum axles & axle nuts Besides 100- front & 110-millimeter rear spacing they also feature oversize 32-millimeter dropout interface washers which further increase the stiffness of the wheels Available in anodized Red Blue Gold & Black with laser etched graphics & contrasting Black interface washers & they are drilled for 36-hole rims Single front hubs in 32H & 36H are available in Black only