The SD Ace Pro is a bolt on rear hub built around a CNC machined aluminium shell, with disc brake mounting and 10mm axle bolts. It runs sealed cartridge bearings and a six quadruple pawl driver for 180 points of engagement, so the pickup is quick when you stamp on the pedals.
It comes with an alloy axle and chromoly bolts, measures 110mm locknut to locknut, and is drilled 36 hole with 58mm flanges both sides. Available in black.
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