Rear Derailleur Hangers X4S and comfortable in extreme winter

and comfortable in extreme winter conditions

Clear business card sleeve and adjustable shoulder strap add travel-ready utility for racers or crews

The shirt features removable CE shoulder/elbow armor (EN 1621-1 certified) plus a perforated PE back pad

and woods riding with superior element resistance

Rear Derailleur Hangers X4S and comfortable in extreme winterThis part is what attaches your derailleur (the component that allows you to shift gears) to your bike frame. In the case of a crash the derailleur hanger is designed to fail before causing damage to the bike frame or the derailleur. It is a good idea to have a spare derailleur hanger handy. Note: the derailleur hanger is specific to your model of bike