Box Two Prime 9 X-Wide 11-50T/12-50T Cassette Size:11-50T Adding an extra tooth to

Adding an extra tooth to each of the three highest gears provides increased durability and decreased wear by distributing the load over a larger area

The chain is polished and then chemically treated to achieve corrosion resistance

View Prime 9 E-Bike Comparison Chart

The derailleur exploits our Limited Slip clutch technology without the Tri-pack features

as they are integral to achieving superior steering stiffness

Box Two Prime 9 X-Wide 11-50T/12-50T Cassette Size:11-50T Adding an extra tooth toThe Box Two Prime 9 X Wide cassette is where Prime 9 began. Originally developed for E MTBs to deliver long service life and a wide gear range with fewer gears, it quickly proved itself on unpowered MTBs as well. All cogs are stamped from steel, with the larger ones pinned to alloy spiders for added strength and durability. Due to its origins, it remains the most durable cassette in the range. Available in two versions, the standard 11 50T is suited