STEP 1.
Remove the Wheel from the mountain bike.
The first stage of repairing your puncture is to remove the wheel from the bike. Now this wont make a huge difference weather you have an Mountain bike or Road bike. So don't worry. The only variant really is if you are trying to remove your front wheel or the rear. The rear is slightly trickier as there are gears involved but the theory is exactly the same, If I run through how to remove a rear wheel, you'll be able to use this for the front wheel but ignore the section about the gears.
Firstly, disengage the brake. Disc braked bikes the only thing to be weary of is the lever. Do not pull it whilst the rotor is not between the caliper. You will only have to bleed your brake! V-brake's and road brakes differ slightly. With V-brakes you have to pull across the little rubber boot and unhook the noodle and road brakes you can simply flick the little tab at the side which will open up the caliper.
With regards to the chain and rear d?railleur, always make sure that you are in 1st gear on the left shifter and the bottom gear on the right shifter eg 7/8/9th. This will put the least amount of tension on the chain and make taking the wheel out much easier. It will also mean that when you come to putting it back in you know what gear to put the chain on. Doing it this way should not affect your gears and thus wont need adjusting afterwards.
Now, either undo the quick release lever or undo the wheel nuts. Your wheel should now simply fall out.
STEP 2.
Remove the tyre from your Mountain Bike
Firstly, deflate the tube as much as you can. Even try pressing in the valve and rolling the wheel against the floor to ensure you get as much air out as possible. Next, make sure you unstick the tyre from the rim. When tyre's are inflated they hook onto the rim and once pressurized they will stay there. To make removing the tyre easier pull the tyre side to side to ensure it is not still hooked onto the rim.
You only have to take the tyre off half the rim, do not take it off completely. Always leave half the tyre on the rim. Weather you use your hands or tyre levers to do so it wont matter, some tyre's you will have to use levers, but always be careful not to damage the rim when doing so. Now you should be able to take out the tube, leaving half the tyre still on the rim.
STEP 3
Replace the tube on your Mountain Bike
Before putting in your new tube, run your hand around the inside of the tyre. This is to make sure that there is nothing stuck in the tyre that would damage the new tube. Also check the rim tape to make sure it covers all the spoke nipple heads as this can also be a factor for punctures.
Inflate the inner tube, only slightly so it has enough air to make it 'round'. This will help when inserting the tube into the tyre. Once the tube is in, all the way round, push the tyre back onto the rim, bit by bit. You may find that the last little bit is a bit harder to get on, it pretty much always will be. Only use tyre levers as a last resort and in doing so be very careful not to pinch the tube or damage the rim.
Inflate the tyre to the recommended pressure and put back into the bike. Make sure you connect your brake up and test it works before riding.
Job done.
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