Changing a Bike Tire on a Mountain Bike

 In other words, position your mountain bike in such a way that the seat and handlebars are on the ground and the 2 tires are in the air. The tires should be able to spin freely without any resistance.

Your tire will be kept on the axle by 2 nuts, 1 on each side, and these nuts will need to be loosened and removed.

• Depending on the make of your mountain bike, you may also need to undo a quick release lever on the side of the tire.
• Disengage the brake cable before pulling out the tire from between the brake pads.

Locate the valve stem for air input and choose a spot on the opposite side of the wheel. Using the beveled end of a tire iron, separate the tire from the wheel rim and latch the iron onto a spoke.

 

Look for anything that could cause future tears or punctures. In particular, thorns, glass shards, and metal shrapnel should be removed.

To find the holes, you can submerge the tube under water and look for bubbles, or you can pump up the tube and listen for any air leaks.

• If a hole is located on a seam or ridge along the tube, the tire patch may not hold well and the tube will be irreparable. In that case, you'll have to purchase a brand new replacement tube.

Roughen the areas of the tube around the holes using sandpaper. Apply a glue-less patch to the tube firmly, covering and sealing the hole as tightly as you can. Wait a few minutes for the patch to bond to the tire

Starting with the valve stem, insert the tube back into the tire. Make sure the valve stem is centered correctly or else it could end up being damaged with future use. Work the tire rubber back into the rim, removing 1 tire iron at a time.

Screw the nuts back onto the axle and reconnect the brake cables. Make sure your tire is centered correctly and be sure that your brakes are working correctly. Pump up the tire