Box One Quantum Rear Axle Kits spinimages=71 The Box Four Rear Derailleur

The Box Four Rear Derailleur is the base of Prime 9 Technology that offers an affordable clutch based 1 by 8-speed derailleur that is simple and light

you may experience chaindrops and/or chainsuck

This headset is designed to allow you to use a 1" fork in a 1 1/8" compatible frame

Made of 7075-T6 aluminum

Box One Quantum Rear Axle Kits spinimages=71 The Box Four Rear DerailleurQuantum Axles are made from hard anodized 7075 T6 aluminum for strength and durability. These axles are designed for use with Quantum rear hubs only and are not compatible with other manufacturers' hubs. The 157mm version works best with traditional Chromoly and aluminum frames, while the 171mm version is designed for carbon frames.