The ZAKK rear cassette hub is made of 6061 and 7075 aluminum with an oversized axle and 10 mm CrMo bolts.
The driver is a one piece construction made of super strong 7075 aluminum and features 6 double pawls. The one piece driver construction allows us to use bigger bearings in the driver. We use two 15x28x7 mm oversize bearings that have a static load rating of 2240 Newton and a dynamic load rating of 4360 Newton. This is more than 200% compared to bearings used by other companies in their single speed drivers. The result is a dramatically increased life time for the driver bearings.
The flanges are spaced symmetrically 35,5 mm from the center line for similar spoke tension on both sides. This gives you a stronger and more balanced wheel.
The big diameter of the axle cups gives you a rigid interface with the dropouts.
Besides this we took off all unnecessary weight, which leads to a total weight of 449 g (11T), 450 g (12T) and 457 g (14T). These weights include steel bolts.
The hub is designed to work with 3/8″ wide chains, 135 mm dropout spacing and comes in 32 and 36 spoke hole versions.
- Specification Zakk (V1) (PDF-Document)