Tech Info

Wheel Building Specs:

 Hub Drive Side F-C (mm) Brake Side F-C (mm) Drive Side Diameter (mm) Brake Side Diameter (mm)
KH-1 Front
KH-1 Front Lefty
KH-1 Rear
KH-1.5 Front
KH-1.5 Front Boost 40.4 25.1 49.0 58.0
KH-1.5 Rear
KH-1.5 Rear Boost 21.6 35.6 76.0 58.0
KH-2 Front
KH-2 Rear
KH-2 Front Fat Bike
KH-2 Rear Fat Bike


Rim ERD (mm) Rim Offset (mm)


KR-RC and KR-RT 572 2.3


KR-29 602 2.5


KR-27.5 568 2.5


KR-29-XCW 600 2.5/7.5 staggered

 If you need help calculating spoke lengths for your particular build, please let us know!

Tire Compatablity and Installation Tips:
We have designed our mountain bike rims to have a tight bead fit which allows easy inflation via a floor pump and the ability to run low pressures without burping. Due to inconsistencies in tire manufacturers some tires fit much tighter than others and can be hard to get on and off. If this is the case, we recommend using a different tire. Maxxis and Specialized tires have been the most easily installed in our experience. Schwalbe (especially SnakeSkin versions), Hutichson and Geax tires often fit extremely tight. If they make your favorite treads, we advise caution and patience.
Use the following tips to ease tire installation:
  • Center the rim inside the middle of the tire so you are working both tire beads onto the rim from the outside in
  • Start with the first bead on the side that has the valve closest to the edge of the rim (due to the asymmetric design)
  • Start the bead on both sides 180 degrees from the valve, finishing at the valve itself
  • Ensure the bead is all the way in the center channel around the circumference as you finish installing each bead
  • The use of a lubricant such as soapy water or Uncle Dick's Bead Slip often helps the process
  • Only use plastic tire levers, never use metal tire levers to install the tires! This can damage the bead and cause catastrophic failure. The Kool Stop Tire Bead Jack is a great tool to ease bead installation. 
How-To Videos: 
Check out our YouTube channel for our how-to videos!


Wheel Building
Our rims are directionally drilled. There is an arrow next to the valve stem. The spoke must follow the direction of the arrow towards the hub when laced. Maximum spoke tension: 130kgf. Recommended max building tension: 120kgf.
Do you have a max rider weight?
Our hubs do not have a maximum rider weight. The maximum rider weight for rims is 225 lbs.
Is there a max rotor size on the hubs?
All hubs and wheels are designed for performance cross-country and trail applications. The maximum rotor diameter is 185mm.  
Are your hubs 11 speed compatible?
Yes, the KH-1.5 and KH-2 hubs are 11 speed compatible. The KH-1 can use the  XX1/XO1 10-42 11 speed cassette modified by Kappius Components.

The KH-1.5 and KH-2 are 11 and 10 speed Shimano/SRAM free hub body compatible as well as SRAM XX1/XO1/X1 compatible with the XD Driver Body option. A 1.8mm spacer is required to run 10 speed cassettes on the 11 speed freehub body, not included.

What kind of bearings do you use?

All bearings are high quality EZO Bearings.

Front hubs utilize 2x 6803 bearings.

Rear drive side wheel bearing is an 6903, rear non-drive side wheel bearing is a 6803 and the small cassette carrier bearing is a 6803.


Are the hub bearings adjustable?

Yes, front and rear hubs have adjustable pre-load. The non-drive side of the axle has an adjustable bearing pre-load collar with a 1.5mm hex head bolt. Loosen the hex bolt and tighten the load collar clockwise to contact the inner bearing race. Only a very light load is required, 7 in-lbs to be exact. Tighten the load collar until you feel contact and back it off about an eighth of a turn. The bearings should spin freely and not have any play. Excess load will cause bearings to wear prematurely. It's better to live with a tiny amount of play than to over tighten causing increased drag and shorter life.

Drive System Lubrication:

The drive system comes lubricated with Dumonde Tech Freehub Oil stock. We recommend a light oil such as the Dumonde Tech or similar for minimum friction. A grease can be used which quiets the drive system sound a bit but will add coasting drag.