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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255/55 R18 109V
255/40 R18 99H
255/60 R18 112V
245/45 R19 102V
215/40 R17 87V
215/65 R17 99H
245/40 R17 95V
215/60 R18 98H
205/45 R17 88V
235/55 R20 105V
215/45 R17 91V
275/45 R21 110V
245/45 R17 99V
195/55 R18 93H
235/50 R17 100V
235/45 R21 101W
235/55 R17 103V
245/45 R21 104V
245/55 R17 106V
255/40 R19 100V
205/60 R17 93V
255/40 R22 103V
235/60 R17 106V
295/35 R22 108W