You'll find the size right on the tyre's sidewall, e.g. 205/55 R16: 205 = width in mm, 55 = profile (sidewall height as % of width), R16 = rim diameter in inches.
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215/55 R18 99V
255/55 R19 111V
235/50 R19 103V
265/50 R19 110V
285/45 R21 113V
255/60 R20 113V
215/60 R17 100H
255/55 R20 110V
265/50 R19 110H
305/40 R21 113V
235/45 R20 100V
215/65 R17 103V
245/50 R19 105V
235/60 R18 107H
255/50 R20 109V
235/55 R18 104H
265/65 R18 116T
235/50 R20 104W
215/65 R17 99H
235/55 R17 103V
255/45 R20 101V
215/70 R16 100S