if im not mistaken, if its not too particulary bad then you can pull it back into shape by tightening the correct spokes but that I know nothing about.

Banging it with a hammer could make it worse unless you know what your doing.

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09 XT660X:

CCC Stainless Rounds, Stage 1 DNA, Stage 2 DNA, PCV With Custom Autotune Map, PCV AutoTune, Home made O2 eliminator, Self machined Fork Spacers, DIY Autotune Switch.