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@Ste_S
Amazingly, after I've measured it, the bottom bracket width is 68mm. Which I guess means it's 24tpi
? Felt certain it'd be 71mm/26tpi with it being a 1982 lower end Carlton.
Inner ring chainline is 41.5mm, can I get away with running it 1.5mm out from the 43mm at the back ? I'll probably end up with a new bottom bracket at some point in the future though now it looks as though it's 24tpi