Unicycling can be hazardous and can result in injuries. Use common sense, ride within your abilities, and wear safety gear. Tuck in laces and avoid wearing loose clothing that could catch in brakes, pedals or other parts of the unicycle. Disk brake rotors become very hot with use - avoid contact! Kris Holm Unicycles cannot accept responsibility for any personal injury that you might sustain or that you might cause to another person as a result of the use, breakage or improper assembly of Kris Holm Unicycles equipment.
Warning: Geared hubs can be dangerous due to the high potential speed and the risk of unplanned dismounts during shifting. Ride within your limits!
KH/Schlumpf geared hubs contain a knurled (rough) bearing on one side. This knurled bearing surface acts as a brace against the tightened bearing housing when you are in high gear mode. Because crank-mount disk brakes apply braking force through the crank, braking in second gear may apply additional force to the knurled braking surface beyond that experienced during normal pedalling.
This additional force may increase the risk of slippage of the knurled surface. Slippage problems were not identified during testing. However, given the newness of this braking technology and wide range of users, we cannot guarantee that slippage of the knurled bearing will not occur for all users under all conditions. Slippage of the knurled bearing in the frame while riding in second gear will most likely lead to falls and could lead to possible injury.
In addition, KH/Schlumpf hubs do not contain a spacer between the crank and bearing, to fix the lateral position of the installed crank (adding one is not recommended and will void the KH/Schlumpf warranty). Slight manufacturing variations may result in the crank being positioned sufficiently close to the frame that the disk rotor installation bolts rub on the frame.
Riders using Spirit Disk Cranks with a disk brake installed KH/Schlumpf Hubs do so at their own risk, and frame modifications are not covered by warranty. Check the tightness of bearing housings on a regular basis. If you experience slippage, do not use disk brakes with the KH/Schlumpf hub.
Note that Spirit cranks, without the disk brake installed, are still a high performance upgrade for use with the KH/Schlumpf hub.
Warning: use of this equipment does not guarantee protection from injury. Always ride within your limits!