With new precision engineering the XTR Shadow medium cage rear derailleurs from Shimano shifts quicker, offers superior clearance and makes for better cable routing. The super low profile design reduces the risk of damage from trail side hazards and debris. Full carbon fibre inner and outer pulley cages and cold forged alloy links and pivot body's help reduce weight significantly. Includes durable low friction pulleys with sealed bearings. The shorter GS cage is best used with single or double cranksets. Top-normal design. Wt.: 181g.