This tool protects the rear derailleur by maintaining chain tension when the rear wheel is removed. It is an ideal tool for bike servicing, washing and transporting your bike. It fits 9mm diameter Quick-Release hooks and 12mm diameter through axle. In addition, it prevents the chain from hitting the surface of the frame. The roller is made of durable Delrin™ material, and the aluminum body is CNC-machined for corrosion resistance. The design of this tool is tool-free for installation.
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