Boundary Hubs 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 spine, which has a larger (24mm) diameter compared to the ISIS-typical 22mm, enabling high strength at 33% lower weight than the KH 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.
|Axle: Q-Axle Micro Spline (24mm)|
|Bearing Spacing: 100mm|
|Weight: 380 g|