Provides great protection to your derailleur against bashes, crashes, or if you just want to be able to toss the bike down on its side without worrying about messing up your derailleur
Available in Shimano and SRAM Styles, but may fit other Derailleur Brands
Each Style available with 9mm or 12mm Axle Holes
Shimano Style may limit the movement from reaching the highest gear with the cheapest model deraileur option ~ Altus, but should be good for all other models
