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  1. If your rim is aluminium, ditch it – it’s a material that accumulates stress and becomes brittle from it. If it’s steel, you can probably bang it back in decent shape!

    Start with [Sheldon Brown’s explanation about truing wheels](https://sheldonbrown.com/tooltips/truing.html).

    > The proper repair in this situation is first to bend the rim back to its normal shape, and then fine-true it with the spokes. Lightweight wheels can be bent fairly easily by placing your knee or foot right on the peak of the bend, and pulling with your hands on either side of the bend. This or a similar technique should be used whenever a rim is bent more than 1 centimeter to the side and there are no broken spokes. Even wheels that have collapsed into the shape of a potato chip usually can be made rideable again with this technique This is a very useful on-the-road repair — it even can be done without removing the wheel from the bike. If you are not sure of your skill, you are less likely to do further damage bending wheels over your knee, spectacular as it may look, than with a spoke wrench used carelessly.

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