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How to Fix a Bicycle Puncture

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Changing a puncture is very simple once you know how, this guide will give you the basic knowledge to enable to fix them yourself.
What you'll need: 
A new inner tube or some patches
A bicycle pump
Tyre levers
Tools to remove the wheel
Tools to adjust the braks
Loosen the brake to enable the wheel to be easily removed from the bicycle. To do this you can either use the barrel adjusters, or use an allen key to loosen the brake.
Remove the wheel from the bike. Either use the correct size spanner and loosen the bolts, or if your bike has quick release levers simply pull the lever away from the frame and the wheel will be loose enough to pull out.
3Use tyre levers to remove the tyre from the wheel. Insert the tyre lever between the rim and the tyre, and then push the lever down to force the tyre off the rim. You can use more than one tyre lever by using them at intervals around the wheel to help force the tyre off.
Remove the inner tube and locate the hole in the tube. The inner tube will be inside the tyre, pull it out. If you are patching the old tube then you need to find where the air is leaking from, you may be able to hear it, but if not you can put the tube in some water to see the bubbles. Once you have located the hole simply apply your glue and patch over the hole and leave for a few minutes to dry.
Check the tyre and rim. You need to check that the tyre has no glass or stone stuck in it that could puncture the tube again. If you find any simply pull it out with some tweezers. Now check inside the rim for anything that could damage the inner tube.
Replace the inner tube. Simply add a little bit of air so that the newly patched tube holds its shape, you only need a small amount of air. Now push it back inside the tyre.
Fit the tyre onto the rim. Put the side of the tyre that has the valve onto the rim first, taking care to put the valve through the hole in the rim. Now work your way around the wheel slowly pushing the tyre back on to the rim with your thumbs. Be careful not the trap the tube between the tyre and rim as this may puncture it. It can be hard to push the tyre on sometimes with only your thumbs, but if you use anything else to push it on you are more likely to trap the tube and puncture it.
Fit the wheel back onto the bike. Simply reverse step 1 and fit the wheel back onto the frame. Remember to readjust your brakes.
Try this at home before you have to do it by yourself at the roadside.
Be careful not to pinch the inner tube between the tyre and rim because you may puncture it again.


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