Tire Size Chart — Diameter, Width & Sidewall by Size

The common car, SUV and truck tire sizes with their overall diameter, width and sidewall height, grouped by wheel size. Every number is computed from the size code itself, so metric and flotation sizes sit on one scale.

15-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
235/75R15	28.88	734	9.25	6.94	698
31x10.50R15	31	787	10.5	8	651
33x12.50R15	33	838	12.5	9	611

16-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
205/55R16	24.88	632	8.07	4.44	811
215/60R16	26.16	664	8.46	5.08	771
245/70R16	29.5	749	9.65	6.75	684
245/75R16	30.47	774	9.65	7.23	662
265/70R16	30.61	777	10.43	7.3	659
265/75R16	31.65	804	10.43	7.82	637
235/85R16	31.73	806	9.25	7.86	636
285/75R16	32.83	834	11.22	8.42	614
315/75R16	34.6	879	12.4	9.3	583

17-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
225/45R17	24.97	634	8.86	3.99	808
235/45R17	25.33	643	9.25	4.16	796
225/65R17	28.52	724	8.86	5.76	707
235/65R17	29.03	737	9.25	6.01	695
245/65R17	29.54	750	9.65	6.27	683
245/70R17	30.5	775	9.65	6.75	661
265/65R17	30.56	776	10.43	6.78	660
255/70R17	31.06	789	10.04	7.03	649
265/70R17	31.61	803	10.43	7.3	638
275/70R17	32.16	817	10.83	7.58	627
285/70R17	32.71	831	11.22	7.85	617
33x12.50R17	33	838	12.5	8	611
315/70R17	34.36	873	12.4	8.68	587
35x12.50R17	35	889	12.5	9	576
37x12.50R17	37	940	12.5	10	545

18-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
265/60R18	30.52	775	10.43	6.26	661
265/65R18	31.56	802	10.43	6.78	639
275/65R18	32.07	815	10.83	7.04	629
285/65R18	32.59	828	11.22	7.29	619
33x12.50R18	33	838	12.5	7.5	611
275/70R18	33.16	842	10.83	7.58	608
35x12.50R18	35	889	12.5	8.5	576

20-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
265/50R20	30.43	773	10.43	5.22	663
275/55R20	31.91	811	10.83	5.95	632
285/55R20	32.34	822	11.22	6.17	624
275/60R20	32.99	838	10.83	6.5	611
33x12.50R20	33	838	12.5	6.5	611
35x12.50R20	35	889	12.5	7.5	576

22-inch wheels

Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs / mile
305/40R22	31.61	803	12.01	4.8	638
285/45R22	32.1	815	11.22	5.05	628

Compare any two sizes

Pick a pair in the comparison tool or start from a popular pair:

275/55R20 vs 275/60R2031.91" → 32.99" (+3.39%)265/70R17 vs 285/70R1731.61" → 32.71" (+3.49%)265/75R16 vs 285/75R1631.65" → 32.83" (+3.73%)245/75R16 vs 265/75R1630.47" → 31.65" (+3.88%)265/65R18 vs 275/65R1831.56" → 32.07" (+1.62%)265/70R17 vs 275/70R1731.61" → 32.16" (+1.74%)225/65R17 vs 235/65R1728.52" → 29.03" (+1.79%)285/70R17 vs 315/70R1732.71" → 34.36" (+5.06%)285/70R17 vs 33x12.50R1732.71" → 33" (+0.89%)285/75R16 vs 315/75R1632.83" → 34.6" (+5.4%)

Sizes are nominal — see method. Last verified November 12, 2026.