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The newer frames like the green one I posted on the previous page have slightly larger clearances, 35 with guards, maybe 38 without
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Mine has 27x 1&1/4" (630) wheels and currently is on 32mm tyres with mudguards, which is probably the limit. If you got one of similar vintage (1982 ish) and fitted it with 700c (622) wheels you could probably go substantially wider. You'd need some very long drop brakes though.
Edit: This listing shows a 700c conversion on the original brakes actually. Does look like there's lots of room for wider tyres though. https://www.ebay.co.uk/itm/295946627695?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=BfBE0sEeQrC&sssrc=4429486&ssuid=2oiWpP7gSxu&var=&widget_ver=artemis&media=COPY
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The 708 framesets can take at least 35 with guards, though the 531 are more limited - I'd suspect 32 with guards, maybe a squeeze 35 without.
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philphillyphilip
ffm
@hugo7
What's the biggest tyre + guards combo you can get on these?