How to Easily Remove the Back Wheel of a Mountain Bike
To remove the back wheel of a mountain bike, shift the chain onto the smallest cog and then release the brake. Flip the bike upside down or use a bike stand to elevate the bike. Use a wrench to loosen the nuts or quick-release lever on the axle. Once loose, slide the wheel out of the dropouts and remove the chain from the cassette. The wheel can then be completely removed from the bike.