OK 650 cc is a volume (ala Motorbike engine displacement)

.. for clarity industry standard ETRTO numbers for bead seat diameter is better..
(middle of the brake track)


571 mm imprinted on the tires ? that's French 650C ,
A is 590, often on 3 speed bikes
B is 584... now Aks 27.5 " in MTB lingo now ..

regular 26" is 559... 2nd number tire width like 559-47 (26" x 1.75")...



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