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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235/65 R17 108V
235/55 R18 100T
255/50 R18 106V
205/55 R17 95H
255/35 R18 94V
205/55 R16 91H
205/60 R16 96H
235/55 R17 99H
215/50 R17 95V
235/50 R18 101V
195/60 R16 89H
205/65 R15 99T
205/65 R16 95H
245/35 R19 93W
255/45 R18 103V
255/45 R22 107H
225/50 R17 98H
225/55 R16 95H
165/65 R15 81T
255/55 R20 110H
225/45 R18 95V
265/40 R19 98V