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550A, 490mm rim diameter. Rear tyre is marked as 22 inch with a fractional width which isn't listed on Sheldon Brown (decimal width is much smaller diameter), didn't even realise it was 550A until I just had a look at the front tyre. Tiny bit smaller than typical 24" wheels that you'd see on mountain bikes.
It's quite fun to ride, nimble and light but a bit too short in length and the drop bars where basically unusable so I flipped and chopped them.
