Wheel and tyre reference charts

Tyre size chart

Overall diameter, width and sidewall for common metric tyre sizes, grouped by rim size. Use it to compare heights before changing size; within about 3% of the original diameter is the usual starting point.

237 metric sizes from the factory and popular setups in our guides, grouped by rim size and sorted by overall diameter.

Tyre sizes by rim

13-inch tyres

13-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
175/60 R13	21.3	540.2	6.9	4.1	948
155/70 R13	21.5	547.2	6.1	4.3	936
175/65 R13	22	557.7	6.9	4.5	919
165/70 R13	22.1	561.2	6.5	4.5	913
175/70 R13	22.6	575.2	6.9	4.8	891
155/80 R13	22.8	578.2	6.1	4.9	886

14-inch tyres

14-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
165/55 R14	21.1	537.1	6.5	3.6	954
175/60 R14	22.3	565.6	6.9	4.1	906
165/65 R14	22.4	570.1	6.5	4.2	899
185/60 R14	22.7	577.6	7.3	4.4	887
195/60 R14	23.2	589.6	7.7	4.6	869
185/65 R14	23.5	596.1	7.3	4.7	859
175/70 R14	23.6	600.6	6.9	4.8	853
205/60 R14	23.7	601.6	8.1	4.8	852
185/70 R14	24.2	614.6	7.3	5.1	834

15-inch tyres

15-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
165/50 R15	21.5	546	6.5	3.2	938
175/50 R15	21.9	556	6.9	3.4	921
195/45 R15	21.9	556.5	7.7	3.5	921
195/50 R15	22.7	576	7.7	3.8	889
225/45 R15	23	583.5	8.9	4	878
185/55 R15	23	584.5	7.3	4	876
205/50 R15	23.1	586	8.1	4	874
195/55 R15	23.4	595.5	7.7	4.2	860
225/50 R15	23.9	606	8.9	4.4	845
185/65 R15	24.5	621.5	7.3	4.7	824
205/60 R15	24.7	627	8.1	4.8	817
195/65 R15	25	634.5	7.7	5	807
215/60 R15	25.2	639	8.5	5.1	802
205/65 R15	25.5	647.5	8.1	5.2	791
225/60 R15	25.6	651	8.9	5.3	787
205/75 R15	27.1	688.5	8.1	6.1	744
215/75 R15	27.7	703.5	8.5	6.3	728
225/75 R15	28.3	718.5	8.9	6.6	713

16-inch tyres

16-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
215/40 R16	22.8	578.4	8.5	3.4	886
195/45 R16	22.9	581.9	7.7	3.5	880
205/45 R16	23.3	590.9	8.1	3.6	867
215/45 R16	23.6	599.9	8.5	3.8	854
195/50 R16	23.7	601.4	7.7	3.8	852
205/50 R16	24.1	611.4	8.1	4	838
195/55 R16	24.4	620.9	7.7	4.2	825
245/45 R16	24.7	626.9	9.6	4.3	817
225/50 R16	24.9	631.4	8.9	4.4	811
205/55 R16	24.9	631.9	8.1	4.4	811
215/55 R16	25.3	642.9	8.5	4.7	797
245/50 R16	25.6	651.4	9.6	4.8	786
205/60 R16	25.7	652.4	8.1	4.8	785
225/55 R16	25.7	653.9	8.9	4.9	783
215/60 R16	26.2	664.4	8.5	5.1	771
235/55 R16	26.2	664.9	9.3	5.1	770
205/65 R16	26.5	672.9	8.1	5.2	761
215/65 R16	27	685.9	8.5	5.5	747
215/65 R16C	27	685.9	8.5	5.5	747
235/60 R16	27.1	688.4	9.3	5.6	744
215/70 R16	27.9	707.4	8.5	5.9	724
225/70 R16	28.4	721.4	8.9	6.2	710
235/70 R16	29	735.4	9.3	6.5	697
225/75 R16	29.3	743.9	8.9	6.6	689
245/70 R16	29.5	749.4	9.6	6.8	684
215/80 R16	29.5	750.4	8.5	6.8	683
235/75 R16	29.9	758.9	9.3	6.9	675
255/70 R16	30.1	763.4	10	7	671
245/75 R16	30.5	773.9	9.6	7.2	662
265/70 R16	30.6	777.4	10.4	7.3	659
275/70 R16	31.2	791.4	10.8	7.6	647
265/75 R16	31.6	803.9	10.4	7.8	637
285/75 R16	32.8	833.9	11.2	8.4	614

17-inch tyres

17-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
205/40 R17	23.5	595.8	8.1	3.2	860
215/40 R17	23.8	603.8	8.5	3.4	848
205/45 R17	24.3	616.3	8.1	3.6	831
235/40 R17	24.4	619.8	9.3	3.7	827
215/45 R17	24.6	625.3	8.5	3.8	819
245/40 R17	24.7	627.8	9.6	3.9	816
225/45 R17	25	634.3	8.9	4	808
255/40 R17	25	635.8	10	4	806
205/50 R17	25.1	636.8	8.1	4	804
235/45 R17	25.3	643.3	9.3	4.2	796
265/40 R17	25.3	643.8	10.4	4.2	796
215/50 R17	25.5	646.8	8.5	4.2	792
275/40 R17	25.7	651.8	10.8	4.3	786
245/45 R17	25.7	652.3	9.6	4.3	785
225/50 R17	25.9	656.8	8.9	4.4	780
205/55 R17	25.9	657.3	8.1	4.4	779
255/45 R17	26	661.3	10	4.5	775
235/50 R17	26.3	666.8	9.3	4.6	768
225/55 R17	26.7	679.3	8.9	4.9	754
215/60 R17C	27.2	689.8	8.5	5.1	743
235/55 R17	27.2	690.3	9.3	5.1	742
215/65 R17	28	711.3	8.5	5.5	720
225/70 R17	29.4	746.8	8.9	6.2	686
245/65 R17	29.5	750.3	9.6	6.3	683
255/65 R17	30.1	763.3	10	6.5	671
245/70 R17	30.5	774.8	9.6	6.8	661
265/65 R17	30.6	776.3	10.4	6.8	660
255/70 R17	31.1	788.8	10	7	649
275/65 R17	31.1	789.3	10.8	7	649
245/75 R17	31.5	799.3	9.6	7.2	641
285/65 R17	31.6	802.3	11.2	7.3	639
265/70 R17	31.6	802.8	10.4	7.3	638
255/75 R17	32.1	814.3	10	7.5	629
275/70 R17	32.2	816.8	10.8	7.6	627
285/70 R17	32.7	830.8	11.2	7.9	617
285/75 R17	33.8	859.3	11.2	8.4	596
315/70 R17	34.4	872.8	12.4	8.7	587

18-inch tyres

18-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
215/35 R18	23.9	607.7	8.5	3	843
225/35 R18	24.2	614.7	8.9	3.1	833
205/40 R18	24.5	621.2	8.1	3.2	825
245/35 R18	24.8	628.7	9.6	3.4	815
215/40 R18	24.8	629.2	8.5	3.4	814
255/35 R18	25	635.7	10	3.5	806
225/40 R18	25.1	637.2	8.9	3.5	804
265/35 R18	25.3	642.7	10.4	3.7	797
235/40 R18	25.4	645.2	9.3	3.7	794
315/30 R18	25.4	646.2	12.4	3.7	793
275/35 R18	25.6	649.7	10.8	3.8	788
215/45 R18	25.6	650.7	8.5	3.8	787
245/40 R18	25.7	653.2	9.6	3.9	784
285/35 R18	25.9	656.7	11.2	3.9	780
225/45 R18	26	659.7	8.9	4	777
255/40 R18	26	661.2	10	4	775
295/35 R18	26.1	663.7	11.6	4.1	772
235/45 R18	26.3	668.7	9.3	4.2	766
265/40 R18	26.3	669.2	10.4	4.2	765
305/35 R18	26.4	670.7	12	4.2	764
275/40 R18	26.7	677.2	10.8	4.3	756
245/45 R18	26.7	677.7	9.6	4.3	756
225/50 R18	26.9	682.2	8.9	4.4	751
255/45 R18	27	686.7	10	4.5	746
235/50 R18	27.3	692.2	9.3	4.6	740
265/45 R18	27.4	695.7	10.4	4.7	736
245/50 R18	27.6	702.2	9.6	4.8	730
235/55 R18	28.2	715.7	9.3	5.1	716
245/55 R18	28.6	726.7	9.6	5.3	705
255/60 R18	30	763.2	10	6	671
265/60 R18	30.5	775.2	10.4	6.3	661
275/60 R18	31	787.2	10.8	6.5	651
285/60 R18	31.5	799.2	11.2	6.7	641
265/65 R18	31.6	801.7	10.4	6.8	639
255/70 R18	32.1	814.2	10	7	629
275/65 R18	32.1	814.7	10.8	7	629
285/65 R18	32.6	827.7	11.2	7.3	619
265/70 R18	32.6	828.2	10.4	7.3	619
275/70 R18	33.2	842.2	10.8	7.6	608
295/70 R18	34.3	870.2	11.6	8.1	589
325/65 R18	34.6	879.7	12.8	8.3	582

19-inch tyres

19-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
255/30 R19	25	635.6	10	3	806
225/35 R19	25.2	640.1	8.9	3.1	800
265/30 R19	25.3	641.6	10.4	3.1	798
235/35 R19	25.5	647.1	9.3	3.2	792
275/30 R19	25.5	647.6	10.8	3.2	791
285/30 R19	25.7	653.6	11.2	3.4	784
245/35 R19	25.8	654.1	9.6	3.4	783
295/30 R19	26	659.6	11.6	3.5	777
255/35 R19	26	661.1	10	3.5	775
225/40 R19	26.1	662.6	8.9	3.5	773
305/30 R19	26.2	665.6	12	3.6	770
265/35 R19	26.3	668.1	10.4	3.7	767
235/40 R19	26.4	670.6	9.3	3.7	764
315/30 R19	26.4	671.6	12.4	3.7	763
275/35 R19	26.6	675.1	10.8	3.8	759
325/30 R19	26.7	677.6	12.8	3.8	756
245/40 R19	26.7	678.6	9.6	3.9	755
285/35 R19	26.9	682.1	11.2	3.9	751
255/40 R19	27	686.6	10	4	746
295/35 R19	27.1	689.1	11.6	4.1	743
265/40 R19	27.3	694.6	10.4	4.2	738
305/35 R19	27.4	696.1	12	4.2	736
275/40 R19	27.7	702.6	10.8	4.3	729
285/40 R19	28	710.6	11.2	4.5	721
255/45 R19	28	712.1	10	4.5	719
245/50 R19	28.6	727.6	9.6	4.8	704
235/55 R19	29.2	741.1	9.3	5.1	691
265/55 R19	30.5	774.1	10.4	5.7	662
235/65 R19	31	788.1	9.3	6	650
255/65 R19	32.1	814.1	10	6.5	629

20-inch tyres

20-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
245/30 R20	25.8	655	9.6	2.9	782
295/25 R20	25.8	655.5	11.6	2.9	781
305/25 R20	26	660.5	12	3	776
255/30 R20	26	661	10	3	775
265/30 R20	26.3	667	10.4	3.1	768
235/35 R20	26.5	672.5	9.3	3.2	762
275/30 R20	26.5	673	10.8	3.2	761
335/25 R20	26.6	675.5	13.2	3.3	758
285/30 R20	26.7	679	11.2	3.4	754
245/35 R20	26.8	679.5	9.6	3.4	754
295/30 R20	27	685	11.6	3.5	748
255/35 R20	27	686.5	10	3.5	746
305/30 R20	27.2	691	12	3.6	741
265/35 R20	27.3	693.5	10.4	3.7	739
315/30 R20	27.4	697	12.4	3.7	735
275/35 R20	27.6	700.5	10.8	3.8	731
325/30 R20	27.7	703	12.8	3.8	729
245/40 R20	27.7	704	9.6	3.9	728
285/35 R20	27.9	707.5	11.2	3.9	724
335/30 R20	27.9	709	13.2	4	723
255/40 R20	28	712	10	4	719
295/35 R20	28.1	714.5	11.6	4.1	717
345/30 R20	28.1	715	13.6	4.1	716
305/35 R20	28.4	721.5	12	4.2	710
275/40 R20	28.7	728	10.8	4.3	704
245/45 R20	28.7	728.5	9.6	4.3	703
275/50 R20	30.8	783	10.8	5.4	654
255/55 R20	31	788.5	10	5.5	650
285/50 R20	31.2	793	11.2	5.6	646
265/55 R20	31.5	799.5	10.4	5.7	641
245/60 R20	31.6	802	9.6	5.8	639
275/55 R20	31.9	810.5	10.8	6	632
255/60 R20	32	814	10	6	629
265/60 R20	32.5	826	10.4	6.3	620
275/60 R20	33	838	10.8	6.5	611
285/60 R20	33.5	850	11.2	6.7	603
295/60 R20	33.9	862	11.6	7	594
275/65 R20	34.1	865.5	10.8	7	592

21-inch tyres

21-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
325/25 R21	27.4	695.9	12.8	3.2	736
285/30 R21	27.7	704.4	11.2	3.4	727
345/25 R21	27.8	705.9	13.6	3.4	726
255/35 R21	28	711.9	10	3.5	720
305/30 R21	28.2	716.4	12	3.6	715
275/35 R21	28.6	725.9	10.8	3.8	706
275/45 R21	30.7	780.9	10.8	4.9	656
315/40 R21	30.9	785.4	12.4	5	652
285/45 R21	31.1	789.9	11.2	5	649

22-inch tyres

22-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
285/25 R22	27.6	701.3	11.2	2.8	730
295/25 R22	27.8	706.3	11.6	2.9	725
285/30 R22	28.7	729.8	11.2	3.4	702
295/30 R22	29	735.8	11.6	3.5	696
275/40 R22	30.7	778.8	10.8	4.3	658
285/40 R22	31	786.8	11.2	4.5	651
295/40 R22	31.3	794.8	11.6	4.6	645
275/45 R22	31.7	806.3	10.8	4.9	635
285/45 R22	32.1	815.3	11.2	5	628
265/50 R22	32.4	823.8	10.4	5.2	622
275/50 R22	32.8	833.8	10.8	5.4	614

23-inch tyres

23-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
295/35 R23	31.1	790.7	11.6	4.1	648
305/35 R23	31.4	797.7	12	4.2	642

24-inch tyres

24-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
295/35 R24	32.1	816.1	11.6	4.1	628
285/40 R24	33	837.6	11.2	4.5	612

26-inch tyres

26-inch tyre sizes with overall diameter
Size	Diameter (in)	Diameter (mm)	Width (in)	Sidewall (in)	Revs per mile
295/30 R26	33	837.4	11.6	3.5	612

Dimensions are calculated from the size on the sidewall. Real tyres vary by model, pressure and wear.

Explained in our guides

Questions

How do you work out a tyre's diameter in inches?

Sidewall = width × aspect ratio ÷ 100 (in mm). Overall diameter = rim in inches + two sidewalls converted to inches (÷ 25.4). For 225/45R17: 225 × 0.45 = 101.25 mm, so 17 + 2 × 3.99 = 24.97 inches.

How much bigger can I go?

Within about 3% of the original overall diameter is a common rule of thumb, but clearance, load rating and the car maker's approval matter more. Use the tyre size calculator to compare two sizes.

What does R mean in a tyre size?

Radial construction. Nearly all modern car tyres are radial.

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