54T star ratchet upgrade kit with 18T finely carved than the 36T star ratchet. Excellent driving efficiency Ideal for MTB and cyclocross 54T Star Ratchet Spring Special Grease Product Color and Size Note: Product color may differ from the actual product depending on your display settings. 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