• I tried some Durano Plus 23mm mounted on 18mm internal width rims which probably came to about 26mm max, and that was completely fine. I didn't check with wider tyres, but I think 28mm actual should be fine too, 30mm actual width might be pushing it. Personally, I'm fine with pretty small side clearances though.

    I will not get another chance to try it though: I discovered a defect / crack in the carbon on the right-hand-side dropout, and arranged a return / refund. So far it's going fine, I've even been refunded the return postage to China. The seller is claiming that this has 'never happened before', but I don't really want to try my luck anymore, Columbus Minimal it is.

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