Quick Release seat post mount or frame mountable

Mounts directly on 31

Perforated for heat and moisture control

or attached to your helmet with the included "action camera" style helmet mount

Box Four 8 Speed Wide Range Groupset - Multi Shift - 11-42T - 8 Speed Back in Stock Quick Release seat post mountThe Box Four range is for those people who just want less fuss! You're fond of Prime 9, but know 8 is enough, and surely 12 42T is plenty of range for an 8 speed cassette. The Box Four derailleur still has the Limited Slip clutch but now arrives with a more compact cage. The custom 8 speed chain is built for abuse, although it's sophisticated enough to have its own wide narrow chainring. Who's this item for: The multishift option is perfect for riders