Box One Quantum Drivers downhill low profile design optimized to

low profile design optimized to be both lightweight and durable

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

We flanked the high-density casing with a tightly packed hoop of aramid fibers

The Box Two 7-speed Downhill cassette gives you the high range without the weight and bulk of the low

CNC-machined bearing cover

Box One Quantum Drivers downhill low profile design optimized toEach Quantum driver is a complete, one piece Chromoly driver supported by three large roller bearings. Inside the driver is six pawls, each with two teeth that engage a 60 tooth ratchet ring, which means the hub has just 6 degrees of engagement. Please note, these drivers are designed only for use with Quantums and are not compatible with other hubs.