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@starfish&coffee
I'm confused. I measured the tyre on my shopper bike and it is 20 inches in diameter. It has an imprint on the wall which says Michelin bla bla 20 x 1 4/6.
But when I order a Schwalbe 20 inch from SJS it's much smaller. I actually measured it and it is only 18 inches in diameter. What gives?