• To be honest, I don't think it'd be dangerous to yourself to ride it - it is a nasty dent, but if anything, the frame would get bent.. which would definately be a shame, but I can't imagine it collapsing in any way that would be able to hurt you..

    I hope you manage to get Witcomb to have a look at it just to be sure, but on the ugly DIY front, you could bondo it to fill the hole a little bit and then wrap a hose clamp around the dent, which would probably prevent the tube from buckling? maybe wrap another one on the left seat stay to make it look intentional :P

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