Box One Quantum Drivers downhill low profile design optimized to

low profile design optimized to be both lightweight and durable

Other features include reaching adjustment for accurate positioning and a barrel adjuster to fine-tune cable tension

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

while the 12-50T E-Bike version features slightly adjusted gear spacing optimized to handle the unique torque and load demands of E-MTB riding

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.