How to Successfully Remove the Rear Wheel of Your Mountain Bike: A Step-by-Step Guide
To remove the rear wheel of a mountain bike, first shift the chain onto the smallest chainring and the smallest cog of the cassette. Open the quick-release lever and loosen the axle nuts using a wrench or pliers. Push down on the derailleur to release tension on the chain and carefully lift the wheel out of the frame. Be sure to remember the order and placement of any washers or spacers so that you can put them back in the correct place when you re-install the wheel.