Ergonomic on/off valve make it easy to grip tube and toggle while you're on the move

Giving the user the ability to regulate gas flow into the tyre was the key to the widespread adoption of compressed gas for roadside use

There are also mesh finger gussets featured to enhance mobility and breathability

Adjustable bar ends provide more options for hand placement and give you something to yank on during tough climbs

The GS1 also works perfectly on fitness or sporty urban bikes

Box Components Four Prime Wide Rear Derailleur - Rear Derailleur - 8 Speed - Black Dangerous Goods Ergonomic on/off valve make itPrime 9 technology for less derailleur travel and better chainline, less wear, and improved lifespan Box Four features: 8 speed with Prime 9 technology and the same construction as Box Three Speed: 8sp Cage: wide Min Max: 11 42t Weight: 290g Colour: black