Data sheet TS-09 · Table

Tire size chart

This tire size chart covers 239 sizes, grouped by rim diameter. Compare nominal overall diameter, section width and sidewall height in inches and millimeters, then follow a size link for more detail. The chart separates formula-based dimensions from tire makers’ published measurements.

Jump to a rim

15″ 22
16″ 27
17″ 51
18″ 44
19″ 12
20″ 39
21″ 2
22″ 26
24″ 14
26″ 2

Table 1

239 tire sizes in inches and millimeters

Nominal numbers by the formula: the tire unloaded, on its measuring rim. Underlined sizes have a sheet of their own.

Tire size chart
Size	Diameter	Width	Sidewall	Revs / mile
15″ rims
205/65R15	25.49″648 mm	8.07″205 mm	5.25″133 mm	791
205/70R15	26.30″668 mm	8.07″205 mm	5.65″144 mm	767
295/50R15	26.61″676 mm	11.61″295 mm	5.81″148 mm	758
215/70R15	26.85″682 mm	8.46″215 mm	5.93″151 mm	751
205/75R15	27.11″689 mm	8.07″205 mm	6.05″154 mm	744
225/70R15	27.40″696 mm	8.86″225 mm	6.20″158 mm	736
215/75R15	27.70″704 mm	8.46″215 mm	6.35″161 mm	728
235/70R15	27.95″710 mm	9.25″235 mm	6.48″165 mm	722
275/60R15	27.99″711 mm	10.83″275 mm	6.50″165 mm	720
225/75R15	28.29″719 mm	8.86″225 mm	6.64″169 mm	713
235/75R15	28.88″734 mm	9.25″235 mm	6.94″176 mm	698
30x9.50R15	30.00″762 mm	9.50″241 mm	7.50″191 mm	672
265/75R15	30.65″779 mm	10.43″265 mm	7.82″199 mm	658
31x10.50R15	31.00″787 mm	10.50″267 mm	8.00″203 mm	651
33x10.50R15	33.00″838 mm	10.50″267 mm	9.00″229 mm	611
33x12.50R15	33.00″838 mm	12.50″318 mm	9.00″229 mm	611
33x13.50R15	33.00″838 mm	13.50″343 mm	9.00″229 mm	611
35x12.50R15	35.00″889 mm	12.50″318 mm	10.00″254 mm	576
35x13.50R15	35.00″889 mm	13.50″343 mm	10.00″254 mm	576
35x14.50R15	35.00″889 mm	14.50″368 mm	10.00″254 mm	576
37x14.50R15	37.00″940 mm	14.50″368 mm	11.00″279 mm	545
38x15.50R15	38.00″965 mm	15.50″394 mm	11.50″292 mm	531
16″ rims
215/55R16	25.31″643 mm	8.46″215 mm	4.66″118 mm	797
215/65R16	27.00″686 mm	8.46″215 mm	5.50″140 mm	747
235/60R16	27.10″688 mm	9.25″235 mm	5.55″141 mm	744
205/70R16	27.30″693 mm	8.07″205 mm	5.65″144 mm	739
215/70R16	27.85″707 mm	8.46″215 mm	5.93″151 mm	724
235/65R16	28.03″712 mm	9.25″235 mm	6.01″153 mm	720
225/70R16	28.40″721 mm	8.86″225 mm	6.20″158 mm	710
235/70R16	28.95″735 mm	9.25″235 mm	6.48″165 mm	697
255/65R16	29.05″738 mm	10.04″255 mm	6.53″166 mm	694
225/75R16	29.29″744 mm	8.86″225 mm	6.64″169 mm	689
245/70R16	29.50″749 mm	9.65″245 mm	6.75″172 mm	684
235/75R16	29.88″759 mm	9.25″235 mm	6.94″176 mm	675
255/70R16	30.06″763 mm	10.04″255 mm	7.03″179 mm	671
215/85R16	30.39″772 mm	8.46″215 mm	7.19″183 mm	664
245/75R16	30.47″774 mm	9.65″245 mm	7.23″184 mm	662
265/70R16	30.61″777 mm	10.43″265 mm	7.30″186 mm	659
275/70R16	31.16″791 mm	10.83″275 mm	7.58″193 mm	647
265/75R16	31.65″804 mm	10.43″265 mm	7.82″199 mm	637
285/70R16	31.71″805 mm	11.22″285 mm	7.85″200 mm	636
235/85R16	31.73″806 mm	9.25″235 mm	7.86″200 mm	636
305/70R16	32.81″833 mm	12.01″305 mm	8.41″214 mm	615
285/75R16	32.83″834 mm	11.22″285 mm	8.42″214 mm	614
33x11.50R16	33.00″838 mm	11.50″292 mm	8.50″216 mm	611
295/75R16	33.42″849 mm	11.61″295 mm	8.71″221 mm	603
315/75R16	34.60″879 mm	12.40″315 mm	9.30″236 mm	583
35x11.50R16	35.00″889 mm	11.50″292 mm	9.50″241 mm	576
385/70R16	37.22″945 mm	15.16″385 mm	10.61″270 mm	542
17″ rims
215/45R17	24.62″625 mm	8.46″215 mm	3.81″97 mm	819
225/45R17	24.97″634 mm	8.86″225 mm	3.99″101 mm	808
205/50R17	25.07″637 mm	8.07″205 mm	4.04″103 mm	804
215/50R17	25.46″647 mm	8.46″215 mm	4.23″108 mm	792
225/50R17	25.86″657 mm	8.86″225 mm	4.43″113 mm	780
225/55R17	26.74″679 mm	8.86″225 mm	4.87″124 mm	754
215/60R17	27.16″690 mm	8.46″215 mm	5.08″129 mm	743
235/55R17	27.18″690 mm	9.25″235 mm	5.09″129 mm	742
225/60R17	27.63″702 mm	8.86″225 mm	5.31″135 mm	730
215/65R17	28.00″711 mm	8.46″215 mm	5.50″140 mm	720
235/60R17	28.10″714 mm	9.25″235 mm	5.55″141 mm	718
225/65R17	28.52″724 mm	8.86″225 mm	5.76″146 mm	707
245/60R17	28.57″726 mm	9.65″245 mm	5.79″147 mm	706
235/65R17	29.03″737 mm	9.25″235 mm	6.01″153 mm	695
245/65R17	29.54″750 mm	9.65″245 mm	6.27″159 mm	683
235/70R17	29.95″761 mm	9.25″235 mm	6.48″165 mm	673
255/65R17	30.05″763 mm	10.04″255 mm	6.53″166 mm	671
225/75R17	30.29″769 mm	8.86″225 mm	6.64″169 mm	666
245/70R17	30.50″775 mm	9.65″245 mm	6.75″172 mm	661
265/65R17	30.56″776 mm	10.43″265 mm	6.78″172 mm	660
235/75R17	30.88″784 mm	9.25″235 mm	6.94″176 mm	653
255/70R17	31.06″789 mm	10.04″255 mm	7.03″179 mm	649
245/75R17	31.47″799 mm	9.65″245 mm	7.23″184 mm	641
265/70R17	31.61″803 mm	10.43″265 mm	7.30″186 mm	638
235/80R17	31.80″808 mm	9.25″235 mm	7.40″188 mm	634
255/75R17	32.06″814 mm	10.04″255 mm	7.53″191 mm	629
275/70R17	32.16″817 mm	10.83″275 mm	7.58″193 mm	627
305/65R17	32.61″828 mm	12.01″305 mm	7.81″198 mm	618
285/70R17	32.71″831 mm	11.22″285 mm	7.85″200 mm	617
33x11.50R17	33.00″838 mm	11.50″292 mm	8.00″203 mm	611
33x12.50R17	33.00″838 mm	12.50″318 mm	8.00″203 mm	611
255/80R17	33.06″840 mm	10.04″255 mm	8.03″204 mm	610
295/70R17	33.26″845 mm	11.61″295 mm	8.13″207 mm	606
305/70R17	33.81″859 mm	12.01″305 mm	8.41″214 mm	596
285/75R17	33.83″859 mm	11.22″285 mm	8.42″214 mm	596
34x10.50R17	34.00″864 mm	10.50″267 mm	8.50″216 mm	593
255/85R17	34.07″865 mm	10.04″255 mm	8.53″217 mm	592
315/70R17	34.36″873 mm	12.40″315 mm	8.68″221 mm	587
295/75R17	34.42″874 mm	11.61″295 mm	8.71″221 mm	586
35x10.50R17	35.00″889 mm	10.50″267 mm	9.00″229 mm	576
35x11.50R17	35.00″889 mm	11.50″292 mm	9.00″229 mm	576
35x12.50R17	35.00″889 mm	12.50″318 mm	9.00″229 mm	576
315/80R17	36.84″936 mm	12.40″315 mm	9.92″252 mm	547
37x11.50R17	37.00″940 mm	11.50″292 mm	10.00″254 mm	545
37x12.50R17	37.00″940 mm	12.50″318 mm	10.00″254 mm	545
37x13.50R17	37.00″940 mm	13.50″343 mm	10.00″254 mm	545
38x11.50R17	38.00″965 mm	11.50″292 mm	10.50″267 mm	531
38x12.50R17	38.00″965 mm	12.50″318 mm	10.50″267 mm	531
38x13.50R17	38.00″965 mm	13.50″343 mm	10.50″267 mm	531
40x13.50R17	40.00″1,016 mm	13.50″343 mm	11.50″292 mm	504
42x13.50R17	42.00″1,067 mm	13.50″343 mm	12.50″318 mm	480
18″ rims
225/40R18	25.09″637 mm	8.86″225 mm	3.54″90 mm	804
235/40R18	25.40″645 mm	9.25″235 mm	3.70″94 mm	794
245/40R18	25.72″653 mm	9.65″245 mm	3.86″98 mm	784
225/45R18	25.97″660 mm	8.86″225 mm	3.99″101 mm	777
215/50R18	26.46″672 mm	8.46″215 mm	4.23″108 mm	762
245/45R18	26.68″678 mm	9.65″245 mm	4.34″110 mm	756
235/50R18	27.25″692 mm	9.25″235 mm	4.63″118 mm	740
215/55R18	27.31″694 mm	8.46″215 mm	4.66″118 mm	738
225/55R18	27.74″705 mm	8.86″225 mm	4.87″124 mm	727
235/55R18	28.18″716 mm	9.25″235 mm	5.09″129 mm	716
225/60R18	28.63″727 mm	8.86″225 mm	5.31″135 mm	704
255/55R18	29.04″738 mm	10.04″255 mm	5.52″140 mm	694
235/60R18	29.10″739 mm	9.25″235 mm	5.55″141 mm	693
245/60R18	29.57″751 mm	9.65″245 mm	5.79″147 mm	682
235/65R18	30.03″763 mm	9.25″235 mm	6.01″153 mm	672
255/60R18	30.05″763 mm	10.04″255 mm	6.02″153 mm	671
265/60R18	30.52″775 mm	10.43″265 mm	6.26″159 mm	661
255/65R18	31.05″789 mm	10.04″255 mm	6.53″166 mm	650
285/60R18	31.46″799 mm	11.22″285 mm	6.73″171 mm	641
265/65R18	31.56″802 mm	10.43″265 mm	6.78″172 mm	639
255/70R18	32.06″814 mm	10.04″255 mm	7.03″179 mm	629
275/65R18	32.07″815 mm	10.83″275 mm	7.04″179 mm	629
305/60R18	32.41″823 mm	12.01″305 mm	7.20″183 mm	622
285/65R18	32.59″828 mm	11.22″285 mm	7.29″185 mm	619
265/70R18	32.61″828 mm	10.43″265 mm	7.30″186 mm	619
235/80R18	32.80″833 mm	9.25″235 mm	7.40″188 mm	615
33x11.50R18	33.00″838 mm	11.50″292 mm	7.50″190 mm	611
33x12.50R18	33.00″838 mm	12.50″318 mm	7.50″190 mm	611
275/70R18	33.16″842 mm	10.83″275 mm	7.58″193 mm	608
325/60R18	33.35″847 mm	12.80″325 mm	7.68″195 mm	605
305/65R18	33.61″854 mm	12.01″305 mm	7.81″198 mm	600
285/70R18	33.71″856 mm	11.22″285 mm	7.85″200 mm	598
295/70R18	34.26″870 mm	11.61″295 mm	8.13″207 mm	589
325/65R18	34.63″880 mm	12.80″325 mm	8.32″211 mm	582
305/70R18	34.81″884 mm	12.01″305 mm	8.41″214 mm	579
285/75R18	34.83″885 mm	11.22″285 mm	8.42″214 mm	579
35x11.50R18	35.00″889 mm	11.50″292 mm	8.50″216 mm	576
35x12.50R18	35.00″889 mm	12.50″318 mm	8.50″216 mm	576
37x11.50R18	37.00″940 mm	11.50″292 mm	9.50″241 mm	545
37x12.50R18	37.00″940 mm	12.50″318 mm	9.50″241 mm	545
37x13.50R18	37.00″940 mm	13.50″343 mm	9.50″241 mm	545
38x11.50R18	38.00″965 mm	11.50″292 mm	10.00″254 mm	531
38x13.50R18	38.00″965 mm	13.50″343 mm	10.00″254 mm	531
38x15.50R18	38.00″965 mm	15.50″394 mm	10.00″254 mm	531
19″ rims
235/40R19	26.40″671 mm	9.25″235 mm	3.70″94 mm	764
245/40R19	26.72″679 mm	9.65″245 mm	3.86″98 mm	755
235/45R19	27.33″694 mm	9.25″235 mm	4.16″106 mm	738
245/45R19	27.68″703 mm	9.65″245 mm	4.34″110 mm	729
235/50R19	28.25″718 mm	9.25″235 mm	4.63″118 mm	714
225/55R19	28.74″730 mm	8.86″225 mm	4.87″124 mm	702
255/50R19	29.04″738 mm	10.04″255 mm	5.02″128 mm	695
235/55R19	29.18″741 mm	9.25″235 mm	5.09″129 mm	691
245/55R19	29.61″752 mm	9.65″245 mm	5.31″135 mm	681
255/55R19	30.04″763 mm	10.04″255 mm	5.52″140 mm	671
275/55R19	30.91″785 mm	10.83″275 mm	5.95″151 mm	652
255/60R19	31.05″789 mm	10.04″255 mm	6.02″153 mm	650
20″ rims
275/40R20	28.66″728 mm	10.83″275 mm	4.33″110 mm	704
255/45R20	29.04″738 mm	10.04″255 mm	4.52″115 mm	695
245/50R20	29.65″753 mm	9.65″245 mm	4.82″123 mm	680
275/45R20	29.74″756 mm	10.83″275 mm	4.87″124 mm	678
255/50R20	30.04″763 mm	10.04″255 mm	5.02″128 mm	671
235/55R20	30.18″767 mm	9.25″235 mm	5.09″129 mm	668
265/50R20	30.43″773 mm	10.43″265 mm	5.22″133 mm	663
255/55R20	31.04″789 mm	10.04″255 mm	5.52″140 mm	650
285/50R20	31.22″793 mm	11.22″285 mm	5.61″143 mm	646
245/60R20	31.57″802 mm	9.65″245 mm	5.79″147 mm	639
275/55R20	31.91″811 mm	10.83″275 mm	5.95″151 mm	632
305/50R20	32.01″813 mm	12.01″305 mm	6.00″153 mm	630
285/55R20	32.34″822 mm	11.22″285 mm	6.17″157 mm	624
265/60R20	32.52″826 mm	10.43″265 mm	6.26″159 mm	620
295/55R20	32.78″833 mm	11.61″295 mm	6.39″162 mm	615
275/60R20	32.99″838 mm	10.83″275 mm	6.50″165 mm	611
33x11.50R20	33.00″838 mm	11.50″292 mm	6.50″165 mm	611
33x12.50R20	33.00″838 mm	12.50″318 mm	6.50″165 mm	611
305/55R20	33.21″844 mm	12.01″305 mm	6.60″168 mm	607
285/60R20	33.46″850 mm	11.22″285 mm	6.73″171 mm	603
295/60R20	33.94″862 mm	11.61″295 mm	6.97″177 mm	594
34x11.50R20	34.00″864 mm	11.50″292 mm	7.00″178 mm	593
275/65R20	34.07″866 mm	10.83″275 mm	7.04″179 mm	592
285/65R20	34.59″879 mm	11.22″285 mm	7.29″185 mm	583
315/60R20	34.88″886 mm	12.40″315 mm	7.44″189 mm	578
35x11.50R20	35.00″889 mm	11.50″292 mm	7.50″191 mm	576
35x12.50R20	35.00″889 mm	12.50″318 mm	7.50″191 mm	576
35x13.50R20	35.00″889 mm	13.50″343 mm	7.50″191 mm	576
35x15.50R20	35.00″889 mm	15.50″394 mm	7.50″191 mm	576
295/65R20	35.10″892 mm	11.61″295 mm	7.55″192 mm	575
325/60R20	35.35″898 mm	12.80″325 mm	7.68″195 mm	570
37x11.50R20	37.00″940 mm	11.50″292 mm	8.50″216 mm	545
37x12.50R20	37.00″940 mm	12.50″318 mm	8.50″216 mm	545
37x13.50R20	37.00″940 mm	13.50″343 mm	8.50″216 mm	545
38x11.50R20	38.00″965 mm	11.50″292 mm	9.00″229 mm	531
38x13.50R20	38.00″965 mm	13.50″343 mm	9.00″229 mm	531
38x15.50R20	38.00″965 mm	15.50″394 mm	9.00″229 mm	531
40x15.50R20	40.00″1,016 mm	15.50″394 mm	10.00″254 mm	504
42x13.50R20	42.00″1,067 mm	13.50″343 mm	11.00″279 mm	480
21″ rims
265/40R21	29.35″745 mm	10.43″265 mm	4.17″106 mm	687
275/50R21	31.83″808 mm	10.83″275 mm	5.41″138 mm	634
22″ rims
305/40R22	31.61″803 mm	12.01″305 mm	4.80″122 mm	638
275/45R22	31.74″806 mm	10.83″275 mm	4.87″124 mm	635
285/45R22	32.10″815 mm	11.22″285 mm	5.05″128 mm	628
265/50R22	32.43″824 mm	10.43″265 mm	5.22″133 mm	622
305/45R22	32.81″833 mm	12.01″305 mm	5.40″137 mm	615
275/50R22	32.83″834 mm	10.83″275 mm	5.41″138 mm	614
33x12.50R22	33.00″838 mm	12.50″318 mm	5.50″140 mm	611
315/45R22	33.16″842 mm	12.40″315 mm	5.58″142 mm	608
355/40R22	33.18″843 mm	13.98″355 mm	5.59″142 mm	608
285/50R22	33.22″844 mm	11.22″285 mm	5.61″143 mm	607
295/50R22	33.61″854 mm	11.61″295 mm	5.81″148 mm	600
305/50R22	34.01″864 mm	12.01″305 mm	6.00″153 mm	593
285/55R22	34.34″872 mm	11.22″285 mm	6.17″157 mm	587
265/60R22	34.52″877 mm	10.43″265 mm	6.26″159 mm	584
295/55R22	34.78″883 mm	11.61″295 mm	6.39″162 mm	580
325/50R22	34.80″884 mm	12.80″325 mm	6.40″163 mm	580
35x12.50R22	35.00″889 mm	12.50″318 mm	6.50″165 mm	576
35x15.50R22	35.00″889 mm	15.50″394 mm	6.50″165 mm	576
305/55R22	35.21″894 mm	12.01″305 mm	6.60″168 mm	573
375/45R22	35.29″896 mm	14.76″375 mm	6.64″169 mm	572
37x12.50R22	37.00″940 mm	12.50″318 mm	7.50″191 mm	545
37x13.50R22	37.00″940 mm	13.50″343 mm	7.50″191 mm	545
38x13.50R22	38.00″965 mm	13.50″343 mm	8.00″203 mm	531
38x15.50R22	38.00″965 mm	15.50″394 mm	8.00″203 mm	531
40x15.50R22	40.00″1,016 mm	15.50″394 mm	9.00″229 mm	504
42x15.50R22	42.00″1,067 mm	15.50″394 mm	10.00″254 mm	480
24″ rims
305/35R24	32.41″823 mm	12.01″305 mm	4.20″107 mm	622
295/45R24	34.45″875 mm	11.61″295 mm	5.23″133 mm	585
35x12.50R24	35.00″889 mm	12.50″318 mm	5.50″140 mm	576
315/45R24	35.16″893 mm	12.40″315 mm	5.58″142 mm	574
355/40R24	35.18″894 mm	13.98″355 mm	5.59″142 mm	573
325/45R24	35.52″902 mm	12.80″325 mm	5.76″146 mm	568
375/40R24	35.81″910 mm	14.76″375 mm	5.91″150 mm	563
315/50R24	36.40″925 mm	12.40″315 mm	6.20″158 mm	554
37x13.50R24	37.00″940 mm	13.50″343 mm	6.50″165 mm	545
375/45R24	37.29″947 mm	14.76″375 mm	6.64″169 mm	541
38x13.50R24	38.00″965 mm	13.50″343 mm	7.00″178 mm	531
38x15.50R24	38.00″965 mm	15.50″394 mm	7.00″178 mm	531
40x15.50R24	40.00″1,016 mm	15.50″394 mm	8.00″203 mm	504
42x15.50R24	42.00″1,067 mm	15.50″394 mm	9.00″229 mm	480
26″ rims
40x15.50R26	40.00″1,016 mm	15.50″394 mm	7.00″178 mm	504
42x15.50R26	42.00″1,067 mm	15.50″394 mm	8.00″203 mm	480

§ 1

How is the chart built?

The common-size groups cover 15, 16, 17, 18, 20 and 22 in rims. The catalog combines those common sizes with every size in the maker tables reviewed on October 15, 2026, for a total of 239 sizes.

By the formula, sidewall height equals section width multiplied by aspect ratio, divided by 100. Overall diameter equals rim diameter multiplied by 25.4 mm, plus 2 sidewall heights. These are unloaded nominal dimensions; the tire size converter uses the same size math.

§ 2

How do you use the chart?

Start with the original tire size on the driver’s door-jamb placard, as described in 49 CFR 571.110 (FMVSS No. 110). Compare it with the size marked on the current tire’s sidewall; 49 CFR 571.139 (FMVSS No. 139) requires a tire size designation. The tire size reading guide explains the marking.

Find the matching rim group, then compare overall diameter before comparing width and sidewall height. A larger rim does not necessarily mean a taller tire: 265/70R17 and 265/65R18 both measure a nominal 31.6 in in overall diameter. Matching diameter does not establish fit; fit depends on the vehicle, wheels and suspension.

17 in rim: 265/70R17 is nominally 31.6 in tall and 10.4 in wide.
18 in rim: 265/65R18 is nominally 31.6 in tall and 10.4 in wide.
20 in rim: 275/60R20 is nominally 33.0 in tall and 10.8 in wide.

§ 3

Why do measured diameters differ?

The formula describes an unloaded nominal tire, not a measured specification for a particular product. For 265/70R17, the formula gives 31.61 in; the chart’s rounded nominal entry is 31.6 in.

Kumho, Firestone, Nitto, Toyo and Mickey Thompson list overall diameters from 31.6 in to 32 in across their 265/70R17 entries. Those maker tables cover 33 tires, including 21 LT and 12 P-metric or passenger versions. Use the maker’s entry for the specific tire rather than treating the nominal chart value as its measured diameter.

Q&A

Common questions

Where can I find my original tire size?

Check the tire and loading placard on the driver’s door jamb. Under 49 CFR 571.110 (FMVSS No. 110), the placard identifies the tire size installed when the vehicle was first sold.

Can different rim sizes have the same tire diameter?

Yes. By the formula, 265/70R17 and 265/65R18 both round to 31.6 in overall diameter, despite their different rim diameters.

Are all tires with the same size marking identical?

No. Kumho, Firestone, Nitto, Toyo and Mickey Thompson list 265/70R17 diameters ranging from 31.6 in to 32 in. Nominal size alone does not give the exact measured dimensions of a particular tire.

Notes

Sources

Each number and rule comes from a source with the date it was checked.

49 CFR 571.139 (FMVSS No. 139), S5.5(b)ecfr.gov · checked Oct 15, 2026
49 CFR 571.110 (FMVSS No. 110), S4.3(d)ecfr.gov · checked Oct 15, 2026

Calculators and size classes

33″22 metric and 11 flotation sizes measure 32.5–33.5″ by the formula305/70R16 · 285/75R16 · 295/75R16 · 305/65R17 · 285/70R17 35″15 metric and 16 flotation sizes measure 34.5–35.5″ by the formula315/75R16 · 325/65R18 · 305/70R18 · 285/75R18 · 285/65R20 37″3 metric and 13 flotation sizes measure 36.5–37.5″ by the formula385/70R16 · 315/80R17 · 375/45R24