The new Primo balance cassette hub offers reliability and speed thanks to the new larger sealed bearings as well as the driver ratchet! It produces nice sound when the wheel spins. The one-piece driver is chromoly and uses sealed type polymer bearings. The 14mm axle is 4130 chromoly to withstand harsh use. The nuts are made of chromoly. Includes two Nylon Hubguards.

Shell Material: 6061 CNC aluminum

Axle Material: 4130 Hollow CrMo HT

Extras: 2x Primo Nylon guards

Driver: 9T with 2x 6802 bearings