Metric tire size to imperial (standard) tire size
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11-28-2013, 05:58 PM
Join Date: Feb 2013
Location: Ozarks Arkansas
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Metric tire size to imperial (standard) tire size
Found some useful tire sizing info that I thought would be helpful. It sure is for me I can never figure tire sizes lol.
13" tires
155/80R13 = 22.8X6.1R13
175/70R13 = 22.6X6.9R13
175/80R13 = 24X6.9R13
185/60R13 = 21.7X7.3R13
185/70R13 = 23.2X7.3R13
185/80R13 = 24.7X7.3R13
205/60R13 = 22.7X8.1R13
215/50R13 = 21.5X8.5R13
225/45R13 = 21X8.9R13
225/50R13 = 21.9X8.9R13
255/40R13 = 21X10R13
14" tires
165/65R14 = 22.4X6.5R14
175/65R14 = 23X6.9R14
175/70R14 = 23.6X6.9R14
185/55R14 = 22X7.3R14
185/60R14 = 22.7X7.3R14
185/65R14 = 23.5X7.3R14
185/70R14 = 24.2X7.3R14
195/55R14 = 22.4X7.7R14
195/60R14 = 23.2X7.7R14
195/65R14 = 24X7.7R14
195/70R14 = 24.7X7.7R14
195/75R14 = 25.5X7.7R14
205/50R14 = 22.1X8.1R14
205/55R14 = 22.9X8.1R14
205/60R14 = 23.7X8.1R14
205/70R14 = 25.3X8.1R14
205/75R14 = 26.1X8.1R14
215/60R14 = 24.2X8.5R14
215/70R14 = 25.9X8.5R14
215/75R14 = 26.7X8.5R14
225/50R14 = 22.9X8.9R14
225/60R14 = 24.6X8.9R14
225/70R14 = 26.4X8.9R14
225/85R14 = 29.1X8.7R14
235/60R14 = 25.1X9.3R14
245/60R14 = 25.6X9.7R14
27X9.5R14
28X8.5R14
15" tires
145/65R15 = 22.4X5.7R15
155/60R15 = 22.3X6.1R15
165/60R15 = 22.8X6.5R15
175/55R15 = 22.6X6.9R15
175/60R15 = 23.3X6.9R15
175/65R15 = 24X6.9R15
185/55R15 = 23X7.3R15
185/60R15 = 23.7X7.3R15
185/65R15 = 24.5X7.3R15
195/45R15 = 21.9X7.7R15
195/50R15 = 22.7X7.7R15
195/55R15 = 23.4X7.7R15
195/60R15 = 24.2X7.7R15
195/65R15 = 25X7.7R15
195/70R15 = 25.7X7.7R15
205/50R15 = 23.1X8.1R15
205/55R15 = 23.9X8.1R15
205/60R15 = 24.7X8.1R15
205/65R15 = 25.5X8.1R15
205/70R15 = 26.3X8.1R15
205/75R15 = 27.1X8.1R15
215/60R15 = 25.2X8.5R15
215/65R15 = 26X8.5R15
215/70R15 = 26.9X8.5R15
215/75R15 = 27.7X8.5R15
215/85R15 = 29.4X8.5R15
225/45R15 = 23X8.9R15
225/50R15 = 23.9X8.9R15
225/55R15 = 24.7X8.9R15
225/60R15 = 25.6X8.9R15
225/70R15 = 27.4X8.9R15
225/75R15 = 28.3X8.9R15
235/50R15 = 24.3X9.3R15
235/60R15 = 26.1X9.3R15
235/70R15 = 28X9.3R15
235/75R15 = 28.9X9.3R15
245/50R15 = 24.6X9.7R15
245/60R15 = 26.6X9.7R15
255/60R15 = 27X10R15
255/65R15 = 28.1X10R15
255/70-15 = 29.1X10R15
255/75R15 = 30.1X10R15
265/70R15 = 29.6X10.4R15
265/75R15 = 30.6X10.4R15
275/35R15 = 22.6X10.8R15
275/50R15 = 25.8X10.8R15
275/60R15 = 28X10.8R15
295/50R15 = 26.6X11.6R15
295/65R15 = 30.1X11.6R15
315/60R15 = 29.9X12.4R15
325/50R15 = 27.8X12.8R15
345/35R15 = 24.5X13.6R15
27X9.5R15
29X10.5R15
29X11.5R15
29X8.5R15
30X10.5R15
30X11.5R15
31X9.5R15
31X10.5R15
31X11R15
31X11.5R15
31X12.5R15
31X13.5R15
32X9.5R15
32X10.5R15
32X11.5R15
33X9.5R15
33X10.5R15
33X11.5R15
33X12.5R15
33X13R15
33X13.5R15
33X14R15
33X14.5R15
33X15.5R15
34X9.5R15
34X10.5R15
34X12.5R15
35X10.5R15
35X12.5R15
35X14.5R15
35X15R15
35X15.5R15
35X16R15
36X12.5R15
36X13.5R15
36X14.5R15
37X12.5R17
37X13.5R17
37X12.5R18
37X12.5R20
37X13.5R20
37X13.5R22
37X12.5R15
37X13R15
37X13.5R15
37X14R15
38X12.5R15
38X15.5R15
38.5X11R15
38.5X14.5R15
38.5X15R15
38.5X16R15
39.5X13.5R15
39.5X15R15
39.5X18R15
40X16R15
42X14R15
42X15R15
42.5X13.5R15
44X18.5R15
44X19.5R15
44X21R15
47X17R15
16" tires
175/50R16 = 22.9X6.9R16
175/55R16 = 23.6X6.9R16
175/60R16 = 24.3X6.9R16
185/55R16 = 24X7.3R16
195/40R16 = 22.1X7.7R16
195/45R16 = 22.9X7.7R16
195/50R16 = 23.7X7.7R16
195/55R16 = 24.4X7.7R16
195/60R16 = 25.2X7.7R16
195/80R16 = 28.3X7.7R16
205/40R16 = 22.5X8.1R16
205/45R16 = 23.3X8.1R16
205/50R16 = 24.1X8.1R16
205/55R16 = 24.9X8.1R16
205/60R16 = 25.7X8.1R16
205/65R16 = 26.5X8.1R16
205/70R16 = 27.3X8.1R16
205/80R16 = 28.9X8.1R16
215/35R16 = 21.9X8.5R16
215/40R16 = 22.8X8.5R16
215/45R16 = 23.6X8.5R16
215/50R16 = 24.5X8.5R16
215/55R16 = 25.3X8.5R16
215/60R16 = 26.2X8.5R16
215/65R16 = 27X8.5R16
215/70R16 = 27.9X8.5R16
215/75R16 = 28.7X8.5R16
215/85R16 = 30.4X8.5R16
225/45R16 = 24X8.9R16
225/50R16 = 24.9X8.9R16
225/55R16 = 25.7X8.9R16
225/60R16 = 26.6X8.9R16
225/65R16 = 27.5X8.9R16
225/70R16 = 28.4X8.9R16
225/75R16 = 29.3X8.9R16
235/55R16 = 26.2X9.3R16
235/60R16 = 27.1X9.3R16
235/65R16 = 28X9.3R16
235/70R16 = 29X9.3R16
235/75R16 = 29.9X9.3R16
235/80R16 = 30.8X9.3R16
235/85R16 = 31.7X9.3R16
245/45R16 = 24.7X9.7R16
245/50R16 = 25.6X9.7R16
245/70R16 = 29.5X9.7R16
245/75R16 = 30.5X9.7R16
255/50R16 = 26X10R16
255/60R16 = 28X10R16
255/65R16 = 29.1X10R16
255/70R16 = 30.1X10R16
255/85R16 = 33.1X10R16
265/70R16 = 30.6X10.4R16
265/75R16 = 31.6X10.4R16
265/80R16 = 32.7X10.4R16
275/45R16 = 25.7X10.8R16
275/70R16 = 31.2X10.8R16
285/75R16 = 32.8X11.2R16
295/75R16 = 33.4X11.6R16
305/70R16 = 32.8X12R16
315/75R16 = 34.6X12.4R16
345/75R16 = 36.4X13.6R16
365/75R16 = 37.6X14.4R16
30X11.5R16
31X10.5R16
31X11R16
31X11.5R16
31X12.5R16
32X9R16
32X10R16
32X11.5R16
33X10.5R16
33X11.5R16
33X12.5R16
33X13R16
33X13.5R16
33X14R16
33X14.5R16
34X9R16
34X10.5R16
34X12.5R16
35X10.5R16
35X12.5R16
35X14.5R16
35X16R16
36X12.5R16
36X13R16
36X13.5R16
36X14.5R16
37X12.5R16
37X13R16
37X13.5R16
37X14R16
38X13R16
38X15.5R16
38.5X11R16
38.5X14.5R16
38.5X15R16
39.5X13.5R16
39.5X15R16
40X16R16
41X14.5R16
42X14R16
42X15R16
42.5X13.5R16
44X19.5R16
44X21R16
17" tires
195/40R17 = 23.1X7.7R17
195/45R17 = 23.9X7.7R17
205/40R17 = 23.5X8.1R17
205/45R17 = 24.3X8.1R17
205/50R17 = 25.1X8.1R17
205/55R17 = 25.9X8.1R17
215/35R17 = 22.9X8.5R17
215/40R17 = 23.8X8.5R17
215/45R17 = 24.6X8.5R17
215/50R17 = 25.5X8.5R17
215/55R17 = 26.3X8.5R17
215/60R17 = 27.2X8.5R17
215/65R17 = 28X8.5R17
215/70R17 = 28.9X8.5R17
225/35R17 = 23.2X8.9R17
225/40R17 = 24.1X8.9R17
225/45R17 = 25X8.9R17
225/50R17 = 25.9X8.9R17
225/55R17 = 26.7X8.9R17
225/60R17 = 27.6X8.9R17
225/65R17 = 28.5X8.9R17
225/70R17 = 29.4X8.9R17
225/75R17 = 30.3X8.9R17
235/40R17 = 24.4X9.3R17
235/45R17 = 25.3X9.3R17
235/50R17 = 26.3X9.3R17
235/55R17 = 27.2X9.3R17
235/60R17 = 28.1X9.3R17
235/65R17 = 29X9.3R17
235/70R17 = 30X9.3R17
235/75R17 = 30.9X9.3R17
235/80R17 = 31.8X9.3R17
245/35R17 = 23.8X9.7R17
245/40R17 = 24.7X9.7R17
245/45R17 = 25.7X9.7R17
245/50R17 = 26.6X9.7R17
245/55R17 = 27.6X9.7R17
245/60R17 = 28.6X9.7R17
245/65R17 = 29.5X9.7R17
245/70R17 = 30.5X9.7R17
245/75R17 = 31.5X9.7R17
255/40R17 = 25X10R17
255/45R17 = 26X10R17
255/50R17 = 27X10R17
255/55R17 = 28X10R17
255/60R17 = 29X10R17
255/65R17 = 30.1X10R17
255/70R17 = 31.1X10R17
255/75R17 = 32.1X10R17
255/80R17 = 33.1X10R17
265/40R17 = 25.3X10.4R17
265/60R17 = 29.5X10.4R17
265/65R17 = 30.6X10.4R17
265/70R17 = 31.6X10.4R17
275/35R17 = 24.6X10.8R17
275/40R17 = 25.7X10.8R17
275/55R17 = 28.9X10.8R17
275/60R17 = 30X10.8R17
275/65R17 = 30.1X10.8R17
275/70R17 = 32.2X10.8R17
285/40R17 = 26X11.2R17
285/65R17 = 31.6X11.2R17
285/70R17 = 32.7X11.2R17
285/75R17 = 33.8X11.2R17
295/35R17 = 25.1X11.6R17
295/40R17 = 26.3X11.6R17
295/70R17 = 33.3X11.6R17
305/65R17 = 32.6X12R17
305/70R17 = 33.8X12R17
315/35R17 = 25.7X12.4R17
315/70R17 = 34.4X12.4R17
335/35R17 = 26.2X13.2R17
345/40R17 = 27.9X13.6R17
31X10.5R17
32X11.5R17
33X10.5R17
33X12.5R17
33X13R17
33X13.5R17
34X10.5R17
35X10.5R17
35X12.5R17
35X14.5R17
36X12.5R17
36X13.5R17
37X12.5R17
37X13R17
37X13.5R17
37X14R17
38X13.5R17
38X14.5R17
38X15.5R17
38.5X14.5R17
39X13.5R17
39.5X13.5R17
39.5X15R17
40X13.5R17
40X14.5R17
40X16R17
41X14.5R17
42X14R17
42X14.5R17
42X15R17
42.5X13.5R17
43X14.5R17
44X19.5R17
44X21R17
47X17R17
49X21R17
54X19.5R17
18" tires
205/40R18 = 24.5X8.1R18
215/35R18 = 23.9X8.5R18
215/40R18 = 24.8X8.5R18
215/45R18 = 25.6X8.5R18
215/55R18 = 27.3X8.5R18
225/35R18 = 24.2X8.9R18
225/40R18 = 25.1X8.9R18
225/45R18 = 26X8.9R18
225/50R18 = 26.9X8.9R18
225/55R18 = 27.7X8.9R18
225/60R18 = 28.6X8.9R18
235/35R18 = 24.5X9.3R18
235/40R18 = 25.4X9.3R18
235/45R18 = 26.3X9.3R18
235/50R18 = 27.3X9.3R18
235/55R18 = 28.2X9.3R18
235/60R18 = 29.1X9.3R18
235/65R18 = 30X9.3R18
245/35R18 = 24.8X9.7R18
245/40R18 = 25.7X9.7R18
245/45R18 = 26.7X9.7R18
245/50R18 = 27.6X9.7R18
245/55R18 = 28.6X9.7R18
245/60R18 = 29.6X9.7R18
245/65R18 = 30.5X9.7R18
255/35R18 = 25X10R18
255/40R18 = 26X10R18
255/45R18 = 27X10R18
255/50R18 = 28X10R18
255/55R18 = 29X10R18
255/60R18 = 30X10R18
255/65R18 = 31.1X10R18
255/70R18 = 32.1X10R18
265/35R18 = 25.3X10.4R18
265/40R18 = 26.3X10.4R18
265/45R18 = 27.4X10.4R18
265/60R18 = 30.5X10.4R18
265/65R18 = 31.6X10.4R18
265/70R18 = 32.6X10.4R18
275/35R18 = 25.6X10.8R18
275/40R18 = 26.7X10.8R18
275/45R18 = 27.7X10.8R18
275/55R18 = 29.9X10.8R18
275/60R18 = 31X10.8R18
275/65R18 = 32.1X10.8R18
275/70R18 = 33.2X10.8R18
285/30R18 = 24.7X11.2R18
285/35R18 = 25.9X11.2R18
285/40R18 = 27X11.2R18
285/45R18 = 28.1X11.2R18
285/50R18 = 29.2X11.2R18
285/55R18 = 30.3X11.2R18
285/60R18 = 31.5X11.2R18
285/65R18 = 32.6X11.2R18
285/70R18 = 33.7X11.2R18
285/75R18 = 34.8X11.2R18
295/30R18 = 25X11.6R18
295/35R18 = 26.1X11.6R18
295/40R18 = 27.3X11.6R18
295/45R18 = 28.5X11.6R18
295/65R18 = 33.1X11.6R18
305/30R18 = 25.2X12R18
305/35R18 = 26.4X12R18
305/60R18 = 32.4X12R18
305/65R18 = 33.6X12R18
305/70R18 = 34.8X12R18
315/30R18 = 25.4X12.4R18
315/35R18 = 26.7X12.4R18
315/40R18 = 27.9X12.4R18
325/60R18 = 33.4X12.8R18
325/65R18 = 34.6X12.8R18
335/30R18 = 25.9X13.2R18
345/30R18 = 26.1X13.6R18
345/35R18 = 27.5X13.6R18
355/65R18 = 36.2X14R18
33X12.5R18
33X13.5R18
35X12.5R18
35X14.5R18
36X13.5R18
37X12.5R18
37X13.5R18
38X13.5R18
38X14.5R18
38X15.5R18
38.5X14.5R18
40X13.5R18
40X14.5R18
41X14.5R18
19" tires
215/35R19 = 24.9X8.5R19
225/35R19 = 25.2X8.9R19
225/40R19 = 26.1X8.9R19
225/45R19 = 27X8.9R19
225/55R19 = 28.7X8.9R19
235/30R19 = 24.6X9.3R19
235/35R19 = 25.5X9.3R19
235/40R19 = 26.4X9.3R19
235/45R19 = 27.3X9.3R19
235/50R19 = 28.3X9.3R19
235/55R19 = 29.2X9.3R19
245/30R19 = 24.8X9.7R19
245/35R19 = 25.8X9.7R19
245/40R19 = 26.7X9.7R19
245/45R19 = 27.7X9.7R19
245/50R19 = 28.6X9.7R19
245/55R19 = 29.6X9.7R19
255/30R19 = 25X10R19
255/35R19 = 26X10R19
255/40R19 = 27X10R19
255/45R19 = 28X10R19
255/50R19 = 29X10R19
255/55R19 = 30X10R19
255/60R19 = 31X10R19
265/30R19 = 25.3X10.4R19
265/35R19 = 26.3X10.4R19
265/40R19 = 27.3X10.4R19
265/50R19 = 29.4X10.4R19
265/55R19 = 30.5X10.4R19
275/30R19 = 25.5X10.8R19
275/35R19 = 26.6X10.8R19
275/40R19 = 27.7X10.8R19
275/45R19 = 28.7X10.8R19
275/50R19 = 29.8X10.8R19
275/55R19 = 30.9X10.8R19
285/30R19 = 25.7X11.2R19
285/35R19 = 26.9X11.2R19
285/40R19 = 28X11.2R19
285/45R19 = 29.1X11.2R19
295/30R19 = 26X11.6R19
295/35R19 = 27.1X11.6R19
295/45R19 = 29.5X11.6R19
305/30R19 = 26.2X12R19
315/25R19 = 25.2X12.4R19
315/30R19 = 26.4X12.4R19
315/35R19 = 27.7X12.4R19
315/40R19 = 28.9X12.4R19
325/30R19 = 26.7X12.8R19
335/30R19 = 26.9X13.2R19
345/30R19 = 27.1X13.6R19
345/35R19 = 28.5X13.6R19
20" tires
225/30R20 = 25.3X8.9R20
225/35R20 = 26.2X8.9R20
235/30R20 = 25.6X9.3R20
235/35R20 = 26.5X9.3R20
235/45R20 = 28.3X9.3R20
235/55R20 = 30.2X9.3R20
245/30R20 = 25.8X9.7R20
245/35R20 = 26.8X9.7R20
245/40R20 = 27.7X9.7R20
245/45R20 = 28.7X9.7R20
245/50R20 = 29.6X9.7R20
245/60R20 = 31.6X9.7R20
255/30R20 = 26X10R20
255/35R20 = 27X10R20
255/40R20 = 28X10R20
255/45R20 = 29X10R20
255/50R20 = 30X10R20
255/55R20 = 31X10R20
265/30R20 = 26X10.4R20
265/35R20 = 27X10.4R20
265/40R20 = 28X10.4R20
265/45R20 = 29X10.4R20
265/50R20 = 30X10.4R20
265/60R20 = 32X10.4R20
275/30R20 = 26.5X10.8R20
275/35R20 = 27.6X10.8R20
275/40R20 = 28.7X10.8R20
275/45R20 = 29.7X10.8R20
275/50R20 = 30.8X10.8R20
275/55R20 = 31.9X10.8R20
275/60R20 = 33X10.8R20
275/65R20 = 34.1X10.8R20
285/25R20 = 25.6X11.2R20
285/30R20 = 26.7X11.2R20
285/35R20 = 27.9X11.2R20
285/40R20 = 29X11.2R20
285/50R20 = 31.2X11.2R20
285/55R20 = 32.3X11.2R20
285/60R20 = 33.5X11.2R20
285/65R20 = 34.6X11.2R20
295/25R20 = 25.8X11.6R20
295/30R20 = 27X11.6R20
295/35R20 = 28.1X11.6R20
295/40R20 = 29.3X11.6R20
295/45R20 = 30.5X11.6R20
295/50R20 = 31.6X11.6R20
305/25R20 = 26X12R20
305/30R20 = 27.2X12R20
305/35R20 = 28.4X12R20
305/45R20 = 30.8X12R20
305/50R20 = 32X12R20
305/55R20 = 33.2X12R20
305/60R20 = 34.4X12R20
315/25R20 = 26.2X12.4R20
315/30R20 = 27.4X12.4R20
315/35R20 = 28.7X12.4R20
315/50R20 = 32.4X12.4R20
325/25R20 = 26.4X12.8R20
325/30R20 = 27.7X12.8R20
325/50R20 = 32.8X12.8R20
325/60R20 = 35.4X12.8R20
335/25R20 = 26.6X13.2R20
335/30R20 = 27.9X13.2R20
345/25R20 = 26.8X13.6R20
345/30R20 = 28.1X13.6R20
355/60R20 = 36.8X14R20
33X12.5R20
33X13.5R20
35X12.5R20
35X14.5R20
36X13.5R20
37X12.5R20
37X13.5R20
38X14.5R20
38X15.5R20
38.5X14.5R20
39.5X13.5R20
39.5X15R20
40X14.5R20
40X15.5R20
41X14.5R20
42X14.5R20
42X15R20
42.5X13.5R20
43X14.5R20
44X19.5R20
44X21R20
49X21R20
54X19.5R20
21" tires
245/30R21 = 26.8X9.7R21
245/35R21 = 27.8X9.7R21
245/40R21 = 28.7X9.7R21
255/30R21 = 27X10R21
255/35R21 = 28X10R21
255/50R21 = 31X10R21
265/30R21 = 27.3X10.4R21
265/35R21 = 28.3X10.4R21
265/40R21 = 29.3X10.4R21
265/45R21 = 30.4X10.4R21
275/30R21 = 27.5X10.8R21
275/35R21 = 28.6X10.8R21
275/40R21 = 29.7X10.8R21
285/30R21 = 27.7X11.2R21
285/35R21 = 28.9X11.2R21
285/45R21 = 31.1X11.2R21
295/25R21 = 26.8X11.6R21
295/30R21 = 28X11.6R21
295/35R21 = 29.1X11.6R21
295/40R21 = 30.3X11.6R21
305/30R21 = 28.2X12R21
325/30R21 = 28.7X12.8R21
355/25R21 = 28X14R21
375/20R21 = 26.9X14.8R21
22" tires
235/30R22 = 27.6X9.3R22
245/30R22 = 27.8X9.7R22
255/30R22 = 28X10R22
255/35R22 = 29X10R22
265/30R22 = 28.3X10.4R22
265/35R22 = 29.3X10.4R22
265/40R22 = 30.3X10.4R22
275/25R22 = 27.4X10.8R22
275/40R22 = 30.7X10.8R22
275/45R22 = 31.7X10.8R22
275/50R22 = 32.8X10.8R22
285/25R22 = 27.6X11.2R22
285/30R22 = 28.7X11.2R22
285/35R22 = 29.9X11.2R22
285/40R22 = 31X11.2R22
285/45R22 = 32.1X11.2R22
295/25R22 = 27.8X11.6R22
295/30R22 = 29X11.6R22
295/40R22 = 31.3X11.6R22
305/30R22 = 29.2X12R22
305/40R22 = 31.6X12R22
305/45R22 = 32.8X12R22
315/25R22 = 28.2X12.4R22
325/50R22 = 34.8X12.8R22
325/55R22 = 36.1X12.8R22
325/60R22 = 37.4X12.8R22
335/25R22 = 28.6X13.2R22
335/55R22 = 36.5X13.2R22
33X12.5R22
35X12.5R22
35X14.5R22
37X13.5R22
40X14.5R22
41X14.5R22
42.5X13.5R22
23" tires
285/35R23 = 30.9X11.2R23
285/40R23 = 32X11.2R23
305/40R23 = 32.6X12R23
24" tires
255/30R24 = 30X10R24
275/25R24 = 29.4X10.8R24
275/30R24 = 30.5X10.8R24
285/30R24 = 30.7X11.2R24
285/35R24 = 31.9X11.2R24
285/40R24 = 33X11.2R24
295/35R24 = 32.1X11.6R24
295/40R24 = 33.3X11.6R24
305/35R24 = 32.4X12R24
315/35R24 = 32.7X12.4R24
385/35R24 = 34.6X15.2R24
405/25R24 = 32X15.9R24
37X13.5R24
40X14.5R24
26" tires
275/25R26 = 31.4X10.8R26
295/25R26 = 31.8X11.6R26
295/30R26 = 33X11.6R26
305/30R26 = 33.2X12R26
315/40R26 = 35.9X12.4R26
28" tires
295/25R28 = 33.8X11.6R28
325/35R28 = 37X12.8R28
13" tires
155/80R13 = 22.8X6.1R13
175/70R13 = 22.6X6.9R13
175/80R13 = 24X6.9R13
185/60R13 = 21.7X7.3R13
185/70R13 = 23.2X7.3R13
185/80R13 = 24.7X7.3R13
205/60R13 = 22.7X8.1R13
215/50R13 = 21.5X8.5R13
225/45R13 = 21X8.9R13
225/50R13 = 21.9X8.9R13
255/40R13 = 21X10R13
14" tires
165/65R14 = 22.4X6.5R14
175/65R14 = 23X6.9R14
175/70R14 = 23.6X6.9R14
185/55R14 = 22X7.3R14
185/60R14 = 22.7X7.3R14
185/65R14 = 23.5X7.3R14
185/70R14 = 24.2X7.3R14
195/55R14 = 22.4X7.7R14
195/60R14 = 23.2X7.7R14
195/65R14 = 24X7.7R14
195/70R14 = 24.7X7.7R14
195/75R14 = 25.5X7.7R14
205/50R14 = 22.1X8.1R14
205/55R14 = 22.9X8.1R14
205/60R14 = 23.7X8.1R14
205/70R14 = 25.3X8.1R14
205/75R14 = 26.1X8.1R14
215/60R14 = 24.2X8.5R14
215/70R14 = 25.9X8.5R14
215/75R14 = 26.7X8.5R14
225/50R14 = 22.9X8.9R14
225/60R14 = 24.6X8.9R14
225/70R14 = 26.4X8.9R14
225/85R14 = 29.1X8.7R14
235/60R14 = 25.1X9.3R14
245/60R14 = 25.6X9.7R14
27X9.5R14
28X8.5R14
15" tires
145/65R15 = 22.4X5.7R15
155/60R15 = 22.3X6.1R15
165/60R15 = 22.8X6.5R15
175/55R15 = 22.6X6.9R15
175/60R15 = 23.3X6.9R15
175/65R15 = 24X6.9R15
185/55R15 = 23X7.3R15
185/60R15 = 23.7X7.3R15
185/65R15 = 24.5X7.3R15
195/45R15 = 21.9X7.7R15
195/50R15 = 22.7X7.7R15
195/55R15 = 23.4X7.7R15
195/60R15 = 24.2X7.7R15
195/65R15 = 25X7.7R15
195/70R15 = 25.7X7.7R15
205/50R15 = 23.1X8.1R15
205/55R15 = 23.9X8.1R15
205/60R15 = 24.7X8.1R15
205/65R15 = 25.5X8.1R15
205/70R15 = 26.3X8.1R15
205/75R15 = 27.1X8.1R15
215/60R15 = 25.2X8.5R15
215/65R15 = 26X8.5R15
215/70R15 = 26.9X8.5R15
215/75R15 = 27.7X8.5R15
215/85R15 = 29.4X8.5R15
225/45R15 = 23X8.9R15
225/50R15 = 23.9X8.9R15
225/55R15 = 24.7X8.9R15
225/60R15 = 25.6X8.9R15
225/70R15 = 27.4X8.9R15
225/75R15 = 28.3X8.9R15
235/50R15 = 24.3X9.3R15
235/60R15 = 26.1X9.3R15
235/70R15 = 28X9.3R15
235/75R15 = 28.9X9.3R15
245/50R15 = 24.6X9.7R15
245/60R15 = 26.6X9.7R15
255/60R15 = 27X10R15
255/65R15 = 28.1X10R15
255/70-15 = 29.1X10R15
255/75R15 = 30.1X10R15
265/70R15 = 29.6X10.4R15
265/75R15 = 30.6X10.4R15
275/35R15 = 22.6X10.8R15
275/50R15 = 25.8X10.8R15
275/60R15 = 28X10.8R15
295/50R15 = 26.6X11.6R15
295/65R15 = 30.1X11.6R15
315/60R15 = 29.9X12.4R15
325/50R15 = 27.8X12.8R15
345/35R15 = 24.5X13.6R15
27X9.5R15
29X10.5R15
29X11.5R15
29X8.5R15
30X10.5R15
30X11.5R15
31X9.5R15
31X10.5R15
31X11R15
31X11.5R15
31X12.5R15
31X13.5R15
32X9.5R15
32X10.5R15
32X11.5R15
33X9.5R15
33X10.5R15
33X11.5R15
33X12.5R15
33X13R15
33X13.5R15
33X14R15
33X14.5R15
33X15.5R15
34X9.5R15
34X10.5R15
34X12.5R15
35X10.5R15
35X12.5R15
35X14.5R15
35X15R15
35X15.5R15
35X16R15
36X12.5R15
36X13.5R15
36X14.5R15
37X12.5R17
37X13.5R17
37X12.5R18
37X12.5R20
37X13.5R20
37X13.5R22
37X12.5R15
37X13R15
37X13.5R15
37X14R15
38X12.5R15
38X15.5R15
38.5X11R15
38.5X14.5R15
38.5X15R15
38.5X16R15
39.5X13.5R15
39.5X15R15
39.5X18R15
40X16R15
42X14R15
42X15R15
42.5X13.5R15
44X18.5R15
44X19.5R15
44X21R15
47X17R15
16" tires
175/50R16 = 22.9X6.9R16
175/55R16 = 23.6X6.9R16
175/60R16 = 24.3X6.9R16
185/55R16 = 24X7.3R16
195/40R16 = 22.1X7.7R16
195/45R16 = 22.9X7.7R16
195/50R16 = 23.7X7.7R16
195/55R16 = 24.4X7.7R16
195/60R16 = 25.2X7.7R16
195/80R16 = 28.3X7.7R16
205/40R16 = 22.5X8.1R16
205/45R16 = 23.3X8.1R16
205/50R16 = 24.1X8.1R16
205/55R16 = 24.9X8.1R16
205/60R16 = 25.7X8.1R16
205/65R16 = 26.5X8.1R16
205/70R16 = 27.3X8.1R16
205/80R16 = 28.9X8.1R16
215/35R16 = 21.9X8.5R16
215/40R16 = 22.8X8.5R16
215/45R16 = 23.6X8.5R16
215/50R16 = 24.5X8.5R16
215/55R16 = 25.3X8.5R16
215/60R16 = 26.2X8.5R16
215/65R16 = 27X8.5R16
215/70R16 = 27.9X8.5R16
215/75R16 = 28.7X8.5R16
215/85R16 = 30.4X8.5R16
225/45R16 = 24X8.9R16
225/50R16 = 24.9X8.9R16
225/55R16 = 25.7X8.9R16
225/60R16 = 26.6X8.9R16
225/65R16 = 27.5X8.9R16
225/70R16 = 28.4X8.9R16
225/75R16 = 29.3X8.9R16
235/55R16 = 26.2X9.3R16
235/60R16 = 27.1X9.3R16
235/65R16 = 28X9.3R16
235/70R16 = 29X9.3R16
235/75R16 = 29.9X9.3R16
235/80R16 = 30.8X9.3R16
235/85R16 = 31.7X9.3R16
245/45R16 = 24.7X9.7R16
245/50R16 = 25.6X9.7R16
245/70R16 = 29.5X9.7R16
245/75R16 = 30.5X9.7R16
255/50R16 = 26X10R16
255/60R16 = 28X10R16
255/65R16 = 29.1X10R16
255/70R16 = 30.1X10R16
255/85R16 = 33.1X10R16
265/70R16 = 30.6X10.4R16
265/75R16 = 31.6X10.4R16
265/80R16 = 32.7X10.4R16
275/45R16 = 25.7X10.8R16
275/70R16 = 31.2X10.8R16
285/75R16 = 32.8X11.2R16
295/75R16 = 33.4X11.6R16
305/70R16 = 32.8X12R16
315/75R16 = 34.6X12.4R16
345/75R16 = 36.4X13.6R16
365/75R16 = 37.6X14.4R16
30X11.5R16
31X10.5R16
31X11R16
31X11.5R16
31X12.5R16
32X9R16
32X10R16
32X11.5R16
33X10.5R16
33X11.5R16
33X12.5R16
33X13R16
33X13.5R16
33X14R16
33X14.5R16
34X9R16
34X10.5R16
34X12.5R16
35X10.5R16
35X12.5R16
35X14.5R16
35X16R16
36X12.5R16
36X13R16
36X13.5R16
36X14.5R16
37X12.5R16
37X13R16
37X13.5R16
37X14R16
38X13R16
38X15.5R16
38.5X11R16
38.5X14.5R16
38.5X15R16
39.5X13.5R16
39.5X15R16
40X16R16
41X14.5R16
42X14R16
42X15R16
42.5X13.5R16
44X19.5R16
44X21R16
17" tires
195/40R17 = 23.1X7.7R17
195/45R17 = 23.9X7.7R17
205/40R17 = 23.5X8.1R17
205/45R17 = 24.3X8.1R17
205/50R17 = 25.1X8.1R17
205/55R17 = 25.9X8.1R17
215/35R17 = 22.9X8.5R17
215/40R17 = 23.8X8.5R17
215/45R17 = 24.6X8.5R17
215/50R17 = 25.5X8.5R17
215/55R17 = 26.3X8.5R17
215/60R17 = 27.2X8.5R17
215/65R17 = 28X8.5R17
215/70R17 = 28.9X8.5R17
225/35R17 = 23.2X8.9R17
225/40R17 = 24.1X8.9R17
225/45R17 = 25X8.9R17
225/50R17 = 25.9X8.9R17
225/55R17 = 26.7X8.9R17
225/60R17 = 27.6X8.9R17
225/65R17 = 28.5X8.9R17
225/70R17 = 29.4X8.9R17
225/75R17 = 30.3X8.9R17
235/40R17 = 24.4X9.3R17
235/45R17 = 25.3X9.3R17
235/50R17 = 26.3X9.3R17
235/55R17 = 27.2X9.3R17
235/60R17 = 28.1X9.3R17
235/65R17 = 29X9.3R17
235/70R17 = 30X9.3R17
235/75R17 = 30.9X9.3R17
235/80R17 = 31.8X9.3R17
245/35R17 = 23.8X9.7R17
245/40R17 = 24.7X9.7R17
245/45R17 = 25.7X9.7R17
245/50R17 = 26.6X9.7R17
245/55R17 = 27.6X9.7R17
245/60R17 = 28.6X9.7R17
245/65R17 = 29.5X9.7R17
245/70R17 = 30.5X9.7R17
245/75R17 = 31.5X9.7R17
255/40R17 = 25X10R17
255/45R17 = 26X10R17
255/50R17 = 27X10R17
255/55R17 = 28X10R17
255/60R17 = 29X10R17
255/65R17 = 30.1X10R17
255/70R17 = 31.1X10R17
255/75R17 = 32.1X10R17
255/80R17 = 33.1X10R17
265/40R17 = 25.3X10.4R17
265/60R17 = 29.5X10.4R17
265/65R17 = 30.6X10.4R17
265/70R17 = 31.6X10.4R17
275/35R17 = 24.6X10.8R17
275/40R17 = 25.7X10.8R17
275/55R17 = 28.9X10.8R17
275/60R17 = 30X10.8R17
275/65R17 = 30.1X10.8R17
275/70R17 = 32.2X10.8R17
285/40R17 = 26X11.2R17
285/65R17 = 31.6X11.2R17
285/70R17 = 32.7X11.2R17
285/75R17 = 33.8X11.2R17
295/35R17 = 25.1X11.6R17
295/40R17 = 26.3X11.6R17
295/70R17 = 33.3X11.6R17
305/65R17 = 32.6X12R17
305/70R17 = 33.8X12R17
315/35R17 = 25.7X12.4R17
315/70R17 = 34.4X12.4R17
335/35R17 = 26.2X13.2R17
345/40R17 = 27.9X13.6R17
31X10.5R17
32X11.5R17
33X10.5R17
33X12.5R17
33X13R17
33X13.5R17
34X10.5R17
35X10.5R17
35X12.5R17
35X14.5R17
36X12.5R17
36X13.5R17
37X12.5R17
37X13R17
37X13.5R17
37X14R17
38X13.5R17
38X14.5R17
38X15.5R17
38.5X14.5R17
39X13.5R17
39.5X13.5R17
39.5X15R17
40X13.5R17
40X14.5R17
40X16R17
41X14.5R17
42X14R17
42X14.5R17
42X15R17
42.5X13.5R17
43X14.5R17
44X19.5R17
44X21R17
47X17R17
49X21R17
54X19.5R17
18" tires
205/40R18 = 24.5X8.1R18
215/35R18 = 23.9X8.5R18
215/40R18 = 24.8X8.5R18
215/45R18 = 25.6X8.5R18
215/55R18 = 27.3X8.5R18
225/35R18 = 24.2X8.9R18
225/40R18 = 25.1X8.9R18
225/45R18 = 26X8.9R18
225/50R18 = 26.9X8.9R18
225/55R18 = 27.7X8.9R18
225/60R18 = 28.6X8.9R18
235/35R18 = 24.5X9.3R18
235/40R18 = 25.4X9.3R18
235/45R18 = 26.3X9.3R18
235/50R18 = 27.3X9.3R18
235/55R18 = 28.2X9.3R18
235/60R18 = 29.1X9.3R18
235/65R18 = 30X9.3R18
245/35R18 = 24.8X9.7R18
245/40R18 = 25.7X9.7R18
245/45R18 = 26.7X9.7R18
245/50R18 = 27.6X9.7R18
245/55R18 = 28.6X9.7R18
245/60R18 = 29.6X9.7R18
245/65R18 = 30.5X9.7R18
255/35R18 = 25X10R18
255/40R18 = 26X10R18
255/45R18 = 27X10R18
255/50R18 = 28X10R18
255/55R18 = 29X10R18
255/60R18 = 30X10R18
255/65R18 = 31.1X10R18
255/70R18 = 32.1X10R18
265/35R18 = 25.3X10.4R18
265/40R18 = 26.3X10.4R18
265/45R18 = 27.4X10.4R18
265/60R18 = 30.5X10.4R18
265/65R18 = 31.6X10.4R18
265/70R18 = 32.6X10.4R18
275/35R18 = 25.6X10.8R18
275/40R18 = 26.7X10.8R18
275/45R18 = 27.7X10.8R18
275/55R18 = 29.9X10.8R18
275/60R18 = 31X10.8R18
275/65R18 = 32.1X10.8R18
275/70R18 = 33.2X10.8R18
285/30R18 = 24.7X11.2R18
285/35R18 = 25.9X11.2R18
285/40R18 = 27X11.2R18
285/45R18 = 28.1X11.2R18
285/50R18 = 29.2X11.2R18
285/55R18 = 30.3X11.2R18
285/60R18 = 31.5X11.2R18
285/65R18 = 32.6X11.2R18
285/70R18 = 33.7X11.2R18
285/75R18 = 34.8X11.2R18
295/30R18 = 25X11.6R18
295/35R18 = 26.1X11.6R18
295/40R18 = 27.3X11.6R18
295/45R18 = 28.5X11.6R18
295/65R18 = 33.1X11.6R18
305/30R18 = 25.2X12R18
305/35R18 = 26.4X12R18
305/60R18 = 32.4X12R18
305/65R18 = 33.6X12R18
305/70R18 = 34.8X12R18
315/30R18 = 25.4X12.4R18
315/35R18 = 26.7X12.4R18
315/40R18 = 27.9X12.4R18
325/60R18 = 33.4X12.8R18
325/65R18 = 34.6X12.8R18
335/30R18 = 25.9X13.2R18
345/30R18 = 26.1X13.6R18
345/35R18 = 27.5X13.6R18
355/65R18 = 36.2X14R18
33X12.5R18
33X13.5R18
35X12.5R18
35X14.5R18
36X13.5R18
37X12.5R18
37X13.5R18
38X13.5R18
38X14.5R18
38X15.5R18
38.5X14.5R18
40X13.5R18
40X14.5R18
41X14.5R18
19" tires
215/35R19 = 24.9X8.5R19
225/35R19 = 25.2X8.9R19
225/40R19 = 26.1X8.9R19
225/45R19 = 27X8.9R19
225/55R19 = 28.7X8.9R19
235/30R19 = 24.6X9.3R19
235/35R19 = 25.5X9.3R19
235/40R19 = 26.4X9.3R19
235/45R19 = 27.3X9.3R19
235/50R19 = 28.3X9.3R19
235/55R19 = 29.2X9.3R19
245/30R19 = 24.8X9.7R19
245/35R19 = 25.8X9.7R19
245/40R19 = 26.7X9.7R19
245/45R19 = 27.7X9.7R19
245/50R19 = 28.6X9.7R19
245/55R19 = 29.6X9.7R19
255/30R19 = 25X10R19
255/35R19 = 26X10R19
255/40R19 = 27X10R19
255/45R19 = 28X10R19
255/50R19 = 29X10R19
255/55R19 = 30X10R19
255/60R19 = 31X10R19
265/30R19 = 25.3X10.4R19
265/35R19 = 26.3X10.4R19
265/40R19 = 27.3X10.4R19
265/50R19 = 29.4X10.4R19
265/55R19 = 30.5X10.4R19
275/30R19 = 25.5X10.8R19
275/35R19 = 26.6X10.8R19
275/40R19 = 27.7X10.8R19
275/45R19 = 28.7X10.8R19
275/50R19 = 29.8X10.8R19
275/55R19 = 30.9X10.8R19
285/30R19 = 25.7X11.2R19
285/35R19 = 26.9X11.2R19
285/40R19 = 28X11.2R19
285/45R19 = 29.1X11.2R19
295/30R19 = 26X11.6R19
295/35R19 = 27.1X11.6R19
295/45R19 = 29.5X11.6R19
305/30R19 = 26.2X12R19
315/25R19 = 25.2X12.4R19
315/30R19 = 26.4X12.4R19
315/35R19 = 27.7X12.4R19
315/40R19 = 28.9X12.4R19
325/30R19 = 26.7X12.8R19
335/30R19 = 26.9X13.2R19
345/30R19 = 27.1X13.6R19
345/35R19 = 28.5X13.6R19
20" tires
225/30R20 = 25.3X8.9R20
225/35R20 = 26.2X8.9R20
235/30R20 = 25.6X9.3R20
235/35R20 = 26.5X9.3R20
235/45R20 = 28.3X9.3R20
235/55R20 = 30.2X9.3R20
245/30R20 = 25.8X9.7R20
245/35R20 = 26.8X9.7R20
245/40R20 = 27.7X9.7R20
245/45R20 = 28.7X9.7R20
245/50R20 = 29.6X9.7R20
245/60R20 = 31.6X9.7R20
255/30R20 = 26X10R20
255/35R20 = 27X10R20
255/40R20 = 28X10R20
255/45R20 = 29X10R20
255/50R20 = 30X10R20
255/55R20 = 31X10R20
265/30R20 = 26X10.4R20
265/35R20 = 27X10.4R20
265/40R20 = 28X10.4R20
265/45R20 = 29X10.4R20
265/50R20 = 30X10.4R20
265/60R20 = 32X10.4R20
275/30R20 = 26.5X10.8R20
275/35R20 = 27.6X10.8R20
275/40R20 = 28.7X10.8R20
275/45R20 = 29.7X10.8R20
275/50R20 = 30.8X10.8R20
275/55R20 = 31.9X10.8R20
275/60R20 = 33X10.8R20
275/65R20 = 34.1X10.8R20
285/25R20 = 25.6X11.2R20
285/30R20 = 26.7X11.2R20
285/35R20 = 27.9X11.2R20
285/40R20 = 29X11.2R20
285/50R20 = 31.2X11.2R20
285/55R20 = 32.3X11.2R20
285/60R20 = 33.5X11.2R20
285/65R20 = 34.6X11.2R20
295/25R20 = 25.8X11.6R20
295/30R20 = 27X11.6R20
295/35R20 = 28.1X11.6R20
295/40R20 = 29.3X11.6R20
295/45R20 = 30.5X11.6R20
295/50R20 = 31.6X11.6R20
305/25R20 = 26X12R20
305/30R20 = 27.2X12R20
305/35R20 = 28.4X12R20
305/45R20 = 30.8X12R20
305/50R20 = 32X12R20
305/55R20 = 33.2X12R20
305/60R20 = 34.4X12R20
315/25R20 = 26.2X12.4R20
315/30R20 = 27.4X12.4R20
315/35R20 = 28.7X12.4R20
315/50R20 = 32.4X12.4R20
325/25R20 = 26.4X12.8R20
325/30R20 = 27.7X12.8R20
325/50R20 = 32.8X12.8R20
325/60R20 = 35.4X12.8R20
335/25R20 = 26.6X13.2R20
335/30R20 = 27.9X13.2R20
345/25R20 = 26.8X13.6R20
345/30R20 = 28.1X13.6R20
355/60R20 = 36.8X14R20
33X12.5R20
33X13.5R20
35X12.5R20
35X14.5R20
36X13.5R20
37X12.5R20
37X13.5R20
38X14.5R20
38X15.5R20
38.5X14.5R20
39.5X13.5R20
39.5X15R20
40X14.5R20
40X15.5R20
41X14.5R20
42X14.5R20
42X15R20
42.5X13.5R20
43X14.5R20
44X19.5R20
44X21R20
49X21R20
54X19.5R20
21" tires
245/30R21 = 26.8X9.7R21
245/35R21 = 27.8X9.7R21
245/40R21 = 28.7X9.7R21
255/30R21 = 27X10R21
255/35R21 = 28X10R21
255/50R21 = 31X10R21
265/30R21 = 27.3X10.4R21
265/35R21 = 28.3X10.4R21
265/40R21 = 29.3X10.4R21
265/45R21 = 30.4X10.4R21
275/30R21 = 27.5X10.8R21
275/35R21 = 28.6X10.8R21
275/40R21 = 29.7X10.8R21
285/30R21 = 27.7X11.2R21
285/35R21 = 28.9X11.2R21
285/45R21 = 31.1X11.2R21
295/25R21 = 26.8X11.6R21
295/30R21 = 28X11.6R21
295/35R21 = 29.1X11.6R21
295/40R21 = 30.3X11.6R21
305/30R21 = 28.2X12R21
325/30R21 = 28.7X12.8R21
355/25R21 = 28X14R21
375/20R21 = 26.9X14.8R21
22" tires
235/30R22 = 27.6X9.3R22
245/30R22 = 27.8X9.7R22
255/30R22 = 28X10R22
255/35R22 = 29X10R22
265/30R22 = 28.3X10.4R22
265/35R22 = 29.3X10.4R22
265/40R22 = 30.3X10.4R22
275/25R22 = 27.4X10.8R22
275/40R22 = 30.7X10.8R22
275/45R22 = 31.7X10.8R22
275/50R22 = 32.8X10.8R22
285/25R22 = 27.6X11.2R22
285/30R22 = 28.7X11.2R22
285/35R22 = 29.9X11.2R22
285/40R22 = 31X11.2R22
285/45R22 = 32.1X11.2R22
295/25R22 = 27.8X11.6R22
295/30R22 = 29X11.6R22
295/40R22 = 31.3X11.6R22
305/30R22 = 29.2X12R22
305/40R22 = 31.6X12R22
305/45R22 = 32.8X12R22
315/25R22 = 28.2X12.4R22
325/50R22 = 34.8X12.8R22
325/55R22 = 36.1X12.8R22
325/60R22 = 37.4X12.8R22
335/25R22 = 28.6X13.2R22
335/55R22 = 36.5X13.2R22
33X12.5R22
35X12.5R22
35X14.5R22
37X13.5R22
40X14.5R22
41X14.5R22
42.5X13.5R22
23" tires
285/35R23 = 30.9X11.2R23
285/40R23 = 32X11.2R23
305/40R23 = 32.6X12R23
24" tires
255/30R24 = 30X10R24
275/25R24 = 29.4X10.8R24
275/30R24 = 30.5X10.8R24
285/30R24 = 30.7X11.2R24
285/35R24 = 31.9X11.2R24
285/40R24 = 33X11.2R24
295/35R24 = 32.1X11.6R24
295/40R24 = 33.3X11.6R24
305/35R24 = 32.4X12R24
315/35R24 = 32.7X12.4R24
385/35R24 = 34.6X15.2R24
405/25R24 = 32X15.9R24
37X13.5R24
40X14.5R24
26" tires
275/25R26 = 31.4X10.8R26
295/25R26 = 31.8X11.6R26
295/30R26 = 33X11.6R26
305/30R26 = 33.2X12R26
315/40R26 = 35.9X12.4R26
28" tires
295/25R28 = 33.8X11.6R28
325/35R28 = 37X12.8R28
#2
11-28-2013, 07:02 PM
Logistics Pro
If you want to calculate it, it's not that hard. Take 235/85R-16 as an example.
The first number (235) is the width of the tire in millimeters. To figure out the width in inches just divide by 25.4 mm/inch: 253/25.4 = 9.25"
The second number (85) is the aspect ratio, which is the sidewall height expressed as a percentage of the width. So the sidewall on this tire is 85% as tall as the tire is wide. So multiply the width by .85 to get the sidewall height: 9.25 x .85 = 7.86"
The third number (16) is the rim diameter in inches. So the overall diameter is the rim diameter plus twice the sidewall height: 16 + 2 x 7.86 = 31.7"
That's why you need all three numbers to know what size a tire is and why a "265" tire (265/70R-16, 30.6" diameter) can be smaller than a "235" tire (235/85R-16, 31.7" diameter).
The first number (235) is the width of the tire in millimeters. To figure out the width in inches just divide by 25.4 mm/inch: 253/25.4 = 9.25"
The second number (85) is the aspect ratio, which is the sidewall height expressed as a percentage of the width. So the sidewall on this tire is 85% as tall as the tire is wide. So multiply the width by .85 to get the sidewall height: 9.25 x .85 = 7.86"
The third number (16) is the rim diameter in inches. So the overall diameter is the rim diameter plus twice the sidewall height: 16 + 2 x 7.86 = 31.7"
That's why you need all three numbers to know what size a tire is and why a "265" tire (265/70R-16, 30.6" diameter) can be smaller than a "235" tire (235/85R-16, 31.7" diameter).
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