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let me put it another way - I have set of bolts from some SKS mudguards that are a year or two old - the bolts screw in perfectly to a bunch of frames I have to hand (Dave Yates, Condor, Orange) but are physically to big to fit in the holes on my undated maybe 1960s Freddie Grubb frame. It's not by much, but there's really no way they're going in. Hence why I'm thinking they're some old imperial size. So I'm not really sure what I'm going to achieve by getting a new set of bolts in the modern standard size (which I think is M5), they'll just be the same as the bolts I already have, no? Unless Condor stock imperial sized bolts, in which case that's really useful info!
ibob-
In reply to ibob, your mudguard fittings are probably 3/16 British Standard Cycle threads, use 2BA or 3/16 UNF.
Could also be 1/4 British Standard Cycle, use 1/4 BSF.I used to get mine from the Engineering dept. at work,but sadly they are no more.
Seem to be available from herehttps://www.gwr-fasteners.co.uk/2ba-hexagon-bolts---stainless-steel-38585-p.asp
Lovely bike
mig
I picked up a new set of mudguard bolts from condor cycles last weeek, they screwed in perfectly.