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sbbohr-
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.
Brommers
Is it possible to fit larger wheels in a brommie, 18 or 20”? Without mods that is