25" is for tire diameter 63cm, tire width 23cm.
27" is for tire diameter 68cm, tire width 25cm.
28" is for tire diameter 72cm, tire width 27cm.
29" is for tire diameter 74cm, tire width 28cm.
30" is for tire diameter 76cm, tire width 30cm.
31" is for tire diameter 78cm, tire width 32cm
Please measure tire diameter and tire width, make sure that both size(tire diameter and tire width) are less than stardard number at the same time. If your tire diameter is 62.25cm, but your tire width is 23.5cm, please choose 27 inch.(62.25cm<63cm, 23.5cm<25cm).
How to calculate diameter of your tire:
If your tire is written with P215/60R16 .
Tire width 215/10<25cm
Then you can choose the size 27" for your tire.
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