How to Easily Remove the Back Tire of Your Mountain Bike
To take a back tire off a mountain bike, you first need to shift the gear to the smallest cog to loosen the chain and make it easier to take off the tire. Use a wrench to loosen the bolts holding the tire in place, and then lift the bike off the ground using a bike stand. Pull the derailleur back and slide the tire off the frame, being careful not to damage the rotor or cassette.