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I’d think if you file the dropout like that then the wheel will just move forward when you pedal. Not much for it to be grabbing onto.
Plus filing it by enough to make any significant difference at the tyre will likely weaken it.
If I was set on fitting bigger tyres in a frame then I’d be looking at dimpling the stays. If the bridges are an issue then either remove them or get someone to relocate them for you.
Im trying to build my mate a rad bike. Cue seeing a rad semi lo pro type thing on ebay with ridic tight clearances at rear. Takes 23mm clincher comfortably but would ideally like to put 25mm tyres on it.
Thought of a few options -
I have done many a bodge before with a file so pretty competent.
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