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How to fix a bike tire
Use an upright bike stand to elevate the wheel while you work.
Alternatively, you can lay the bike on its left side-that is, with the bike chain and rear derailleur facing up. If necessary, you can turn the bike upside down to work on it, but you may damage the handlebars or seat this way.
Loosen the nuts on the wheel axle with a wrench. Use silicone spray or even cooking spray if the nuts refuse to loosen with a wrench or ratchet alone.