Hope Pro 5 Rear 6 Bolt 12x157mm Disc Hub - Rear - 12x157mm Superboost - XD Driver - 6 Bolt - 32 Hole - J-Bend - Black YGroup_7034229162029 The "square edges" or "rounded

The "square edges" or "rounded edges" refers to the outer edges of the rotor

Mount style: These are mounted on any standard handle bar

BRACE LINK for optimal adjustment of the shoulder straps

1 x Handlebar Mount

Hope Pro 5 Rear 6 Bolt 12x157mm Disc Hub - Rear - 12x157mm Superboost - XD Driver - 6 Bolt - 32 Hole - J-Bend - Black YGroup_7034229162029 The "square edges" or "roundedA reduction in drag, increased engagement plus no loss of durability: the Pro 5 is the next evolution of hub from Hope Technology. Features: Improved sealing to stop dirt ingress and to reduce drag New Labyrinth seal has zero drag for incredible freewheeling performance New Pawls Springs design to increase longevity, load capacity & a reduction of drag Increased engagement from 44 to 108 with a new offset 6 pawl freehub design New step down axle