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Rear dropout stretched wider?

Hi all,

(TL;DR: alu rear dropout measures 141mm, any ideas about causes or solutions)

I'm appealing to the collective for your advice. I have a 2015 aluminium GT Grade that now mainly lives on the turbo. There's been some issues with shifting and derailleur alignment but it hasn't been too much of a problem.

I took it off the turbo and tried to put the wheel back in and noticed it wouldn't fit properly in the dropouts and the tyre was misaligned by the chainstays. After a lot of fettling and swearing I noticed a big gap on one side of the wheel hub. I was about to check frame alignment but first measured the width between dropouts and it measured 141mm rather than expected 135mm.

Frame has been looked after well, only crash was a gentle slide out onto non-drive side, so have no idea how it could stretch out.

Has anyone got any suggestions about what my options are? As it's aluminium, I'm guessing it can't be bent back without a lot of heat.

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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