Upgrade Kit for Ratchet EXP Hub The engagement angle is 6.6°, and can be changed to a better wheel. Ideal for MTB and cyclocross Set Includes: Ratchet EXP54T, spring, shimring, and special grease. Product color and size information may differ from the actual product depending on your display. Product specifications, logo design, etc. may be subject to change for product improvement. We also cannot answer measurements or personal fit that the manufacturer does not announce. Please be aware of