shimano front mountain bicycle hub - hb-m525 (black - 36h) shimano shimano deore hb-m618/ m615/ m590/ m525a front hubs6-bolt iso disc mounting surfacedouble contact sealingsuper polished bearing races for low friction rollingitem specifications left61weight304hub drilling36front axleqr x 100mmhub/brake compatibility6-bolt disccenter to flange, right33center to flange, right61flange diameter,defined colorblackcolorblackflange diameterflange diameter