If you assume a 2.55" tyre to be 65mm tall, and a 1.9" tyre to be 50mm. You get the following diameter range....
From- 622 + (2x65) = 752mm down to- 622 + (2x50) = 722mm
@Smallfurry started
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If you assume a 2.55" tyre to be 65mm tall, and a 1.9" tyre to be 50mm. You get the following diameter range....
From-
622 + (2x65) = 752mm
down to-
622 + (2x50) = 722mm