Rear Derailleur Hangers X4S easy donning and doffing over

easy donning and doffing over riding gear

The 450D abrasion-resistant polyester shell is built to withstand rugged conditions

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

Four-way stretch perforated neoprene cuff provides support

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

Rear Derailleur Hangers X4S easy donning and doffing overThis 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