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If the "R" value of your tyre is smaller than "R16", you can directly choose the small size.
If the "R" value of your tyre is greater than or equal to "R16", please check below:
Frequently used specification
S: Tyre diameter smaller than 25 inches.
L: Tyre diameter less than 80 cm.
Method for calculating the tyre diameter:
For example: Tyre specification 195/55 R15 85V tyres.
Method of converting the diameter: Diameter (cm)=W* AR/500+R* 2.54 Formula: Diameter = W* AR/500 + 2.54* R = 195* 55/500+2.54* 15 = 59.55.
After calculation, the small dimensions are suitable.