Kris Holm Boundary Disc 36H Hub

Boundary cranks are the latest offering from Kris Holm to enable the highest possible strength to weight ratio and pedal performance in a unicycle hub.

The Boundary hub uses the Q-Axle micro spline, which has a larger (24mm) diameter compared to the ISIS-type 22mm, enabling high strength at 33% lower weight than the KH Moment and Spirit hub. 

Cranks are fixed by tightening two bolts on the crank, which makes them easy to install and remove without wear-and-tear on the splines. 

The 42 mm bearing and 100-mm bearing-bearing spacing is compatible with all ISIS-ready frames.

Should you want to build the wheel, here is a link to the spoke calculator so you can find the correct spoke length you need.

Features:
•  Splined Drive interface
•  Unicycle Bearings - ISIS 42mm
•  Bearing pitch of 100mm (Industry standard)
•  Spoke Holes: 36

•  Weight: 389g (420g including bearings)

Hub Detail:

• Please see our spoke calculator for this information

Note: This hub utilizes 42mm bearings, and is compatible with 42mm frame/bearing housings only.