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@YouSir56922
Thanks for the comments! I rode it to work this morning having been on Boris bikes for the last 5 weeks and it felt incredible. The gearing feels OK though even with a 46T front ring I doubt I'll be troubling that 11-tooth sprocket much in central London. I have a Tiagra 12-30 cassette which may be more suitable but it is big and ugly!
@fizzy.bleach - I thought my own was a bit TLDR to be honest! Prolonged use of Boris bikes made me determined to get it built and get on it.
@hugo7 I guess it might depend on exactly how the tyres actually measure up but I very much doubt I could get anything bigger in there, so I would caution against 28s.
On the Ribble website they say the Alu Audax frame is only designed for tyres up to 23mm but I couldn't find any definitive advice about the steel frame so I gambled a bit with 25s and I think I only just got away with it.