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  • I've run mine with 355mm ERTRO 18" wheels and it's been fine. Of course the 18" description is a tad misleading given that the rim radius is a mere 3mm larger than the 349mm wheels used on a Brompton, but it is nonetheless technically an 18" wheel. Even if it measures much less than 18" in diameter.

  • Yes, as you are technically correct in real world terms 3mm is nothing so I don’t class that as 18” as you mention. Vincent @ Eerder metaal has now got 406mm x30 and an 18x 2” or so in there with his self built parts!

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