Refitting a new tube

It’s vital to work out what caused the puncture before you fit a new tube. If the problem’s still there when you fit a new tube, you’ll puncture again straight away – which is even more irritating if you haven’t got a second spare tube.

Your first step is to inspect the tyre carefully. Look around the outside for thorns, shards of glass or sharp stones. If you can’t see anything from the outside, check the inside of the tyre too. The easiest way to locate the culprit is to feel around inside the tyre with your fingers, moving slowly and carefully to avoid cutting yourself. If you’re still unsure what caused the flat, pump air into the tube and locate the hole. You may be able to hear it rushing out of a big hole. Smaller holes can be harder to find – pass the tube slowly through your hands so that you can feel the air on your skin. You can put the tube in a bowl of water and watch for bubbles,…

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Bike Maintenance Tips, Tricks & Techniques (Digital) - 1 Issue, Bike Maintenance Tips, Tricks & Techniques 3rd Edition

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