The ZAKK 4140 rear cassette hub is made of 6061 and 7075 aluminum with an oversized axle, 4140 driver and 10 mm CrMo bolts.
We have created this version with two things in mind: First, to offer a fully wear resistant driver to people who ride very much and under hard conditions. That´s why this version is also suggested for singlespeed cc riding, besides street and trails. Second, the steel version offers a great budget-performance ratio.
The driver is a one piece construction made of super strong 4140 steel and features 6 double pawls, same as the Aluminum version. 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.
Weights are 488 g (11T) and 494 g (12T). 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)