distinguish between removing hand on being pricked and riding a bicycle
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Answer:here are two primary causes for punctures—one that you can to some extent control and one you can’t. The first is what’s known as a pinchflat and is caused by tyre pressure being too low, causing the tyre to compress when hitting a bump and pinching the tube against the rim. What this looks like is two thin slits in the tube. This gives a pinch flat its other name: a ‘snakebite’. One way of avoiding such punctures is by ensuring you maintain correct tyre pressure. This is usually marked on the sidewall of your tyre (given in PSI). Your optimal pressure may depend on a range of different factors, including surface conditions, weather, tyre volume, your personal preferences for a harder or softer ride and your weight. Let’s just focus on the last one for now. Simple solution: if you’re at the heavier end of the spectrum, inflate the tyre closer to the upper limit, as more weight presses the rim closer to the ground, increasing the risk of a pinch-flat. If you’re a lighter rider, it’s safe to run the pressure toward the lower end of that range; if the tyre is too firm, you may find the ride is uncomfortably jarring, and lose grip as the tyre won’t conform to the ground. As materials used in bicycle inner tubes are slightly porous, it’s normal for them to lose pressure over time. As such, it’s a good idea to get in the habit of checking your tyre pressure weekly. The other major cause of punctures is something working its way through the tyre, pricking the tube and causing it to deflate. This can either be instantaneous, or a delayed process presenting itself some way down the track—always, it seems, at a time of great inconvenience. Keep an eye on the condition of your tyres and every so often, deflate the tyre, and go around it picking out any fragments of glass with a sharp point. To prolong the life of your tyres, a dab of superglue on larger slits will help seal the hole.
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