WhatSizeTire

Tire size chart in inches

Metric tire sizes give width in millimeters and sidewall as a percentage, which makes them hard to picture. This chart converts a selection of sizes on 15 to 22 inch wheels into inches using the standard formula.[1 · Oct 29, 2026][2 · Oct 29, 2026]

A smiling tire shop technician and a customer in a flannel shirt hold up two tires side by side in front of a full tire rack (AI-generated image)

The selection covers a spread of car, crossover, SUV and pickup sizes. It isn't a list of best sellers, and it doesn't say which vehicle uses which size: that's on your vehicle's tire label.[3 · Oct 29, 2026]

15 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
195/65R1524.98 in
634 mm		7.68 in
195 mm		4.99 in
126.8 mm		15 in807
205/65R1525.49 in
648 mm		8.07 in
205 mm		5.25 in
133.2 mm		15 in791
215/70R1526.85 in
682 mm		8.46 in
215 mm		5.93 in
150.5 mm		15 in751
235/75R1528.88 in
734 mm		9.25 in
235 mm		6.94 in
176.2 mm		15 in698

16 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
205/55R1624.88 in
632 mm		8.07 in
205 mm		4.44 in
112.8 mm		16 in811
215/60R1626.16 in
664 mm		8.46 in
215 mm		5.08 in
129.0 mm		16 in771
225/70R1628.40 in
721 mm		8.86 in
225 mm		6.20 in
157.5 mm		16 in710
245/75R1630.47 in
774 mm		9.65 in
245 mm		7.23 in
183.8 mm		16 in662
265/75R1631.65 in
804 mm		10.43 in
265 mm		7.82 in
198.8 mm		16 in637

17 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
215/55R1726.31 in
668 mm		8.46 in
215 mm		4.66 in
118.2 mm		17 in767
225/45R1724.97 in
634 mm		8.86 in
225 mm		3.99 in
101.2 mm		17 in808
225/65R1728.52 in
724 mm		8.86 in
225 mm		5.76 in
146.2 mm		17 in707
235/65R1729.03 in
737 mm		9.25 in
235 mm		6.01 in
152.8 mm		17 in695
245/65R1729.54 in
750 mm		9.65 in
245 mm		6.27 in
159.2 mm		17 in683
265/65R1730.56 in
776 mm		10.43 in
265 mm		6.78 in
172.2 mm		17 in660
265/70R1731.61 in
803 mm		10.43 in
265 mm		7.30 in
185.5 mm		17 in638
285/70R1732.71 in
831 mm		11.22 in
285 mm		7.85 in
199.5 mm		17 in617

18 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
225/40R1825.09 in
637 mm		8.86 in
225 mm		3.54 in
90.0 mm		18 in804
225/60R1828.63 in
727 mm		8.86 in
225 mm		5.31 in
135.0 mm		18 in704
235/60R1829.10 in
739 mm		9.25 in
235 mm		5.55 in
141.0 mm		18 in693
255/70R1832.06 in
814 mm		10.04 in
255 mm		7.03 in
178.5 mm		18 in629
275/65R1832.07 in
815 mm		10.83 in
275 mm		7.04 in
178.8 mm		18 in629

19 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
235/35R1925.48 in
647 mm		9.25 in
235 mm		3.24 in
82.2 mm		19 in792
235/55R1929.18 in
741 mm		9.25 in
235 mm		5.09 in
129.2 mm		19 in691
255/55R1930.04 in
763 mm		10.04 in
255 mm		5.52 in
140.2 mm		19 in671

20 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
245/45R2028.68 in
728 mm		9.65 in
245 mm		4.34 in
110.2 mm		20 in703
255/50R2030.04 in
763 mm		10.04 in
255 mm		5.02 in
127.5 mm		20 in671
275/55R2031.91 in
810 mm		10.83 in
275 mm		5.95 in
151.2 mm		20 in632
275/60R2032.99 in
838 mm		10.83 in
275 mm		6.50 in
165.0 mm		20 in611
275/65R2034.07 in
866 mm		10.83 in
275 mm		7.04 in
178.8 mm		20 in592

22 in wheels

SizeOverall diameterSection widthSidewall heightRimRevs per mile
265/40R2230.35 in
771 mm		10.43 in
265 mm		4.17 in
106.0 mm		22 in665
285/45R2232.10 in
815 mm		11.22 in
285 mm		5.05 in
128.2 mm		22 in628

The math (our own arithmetic): sidewall height = width × aspect ratio ÷ 100; overall diameter = rim × 25.4 + 2 × sidewall (mm), ÷ 25.4 for inches; revs per mile = 63,360 ÷ (π × diameter in inches); true speed = indicated speed × new diameter ÷ original diameter. These are nominal figures from the size code. Tire Rack notes that real tires differ from the formula, so use the tire maker's published spec when clearance is tight.[2 · Oct 29, 2026]

Reading the chart

Sources: 1. Tire Industry Association, Reading a tire sidewall. 2. Tire Rack, How do I calculate tire dimensions?. 3. NHTSA, Tires. 4. Tire Rack, What are plus size wheels and tires?. 5. BFGoodrich, Changing tire size. 6. Tire Rack, How do I measure a tire's overall diameter?. Checked Oct 29, 2026. Size dimensions, revolutions per mile and speedometer figures are our own arithmetic from the size code. Trademarks belong to their owners; figures are restated in our own words and tables, not reproduced.