Shimano 6-11 speed Road Bike Rear Mechs – choice of models through the years. Short medium and long cage available. Distances quoted below and in menu measured between jockey wheel centres – to know what you need the easiest way is to check against your current set up. Select from drop down menu to select different models/pictures/prices. Note that Shimano mech compatibility is wide and can be used across groups and speeds in many cases with the exception of early Dura Ace. Details in menu for each numbered item.