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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205/50 R17 93H
225/65 R17 106H
285/30 R22 101W
225/45 R18 95V
225/35 R19 88W
275/35 R21 103W
235/50 R19 99H
235/65 R17 108V
265/35 R22 102W
295/30 R21 102V
225/45 R19 96V
245/50 R18 104V
225/45 R18 95H
205/45 R18 90V
275/35 R22 104W
275/40 R20 106V
225/55 R19 99V
225/40 R19 93W
225/50 R17 98H
215/40 R18 89V
285/35 R22 106W
275/50 R19 112V
215/55 R16 97H