Your non-drive side crank arm is reverse threaded

This design minimised the chance of vibration

Compatible with 31

A worn out bearing can cause creaking

How does it mount to the car: Mounts to a standard 50mm towball

Granite Design Rock N Roll Ratchet Tool - Black Exclusive Your non-drive side crank armDon't let a loose bolt ruin your ride! It doesn't matter whether you're on a short or long ride, a suspension bolt backing out can ruin your ride. Thankfully, Granite Design has a handy toolkit with a ratchet set that will tighten 95% of the hardware on your bike. The small but tough toolkit contains all the common sized bits and the handy pouch is designed to work flawlessly with their Rockband carrier strap. You can easily store this kit on your