Tire sizes by height

What size is a 31-inch tire?

A 31-inch tire is about 31 inches tall. In flotation sizing it is written 31x10.50 (followed by the wheel size, e.g. 31x10.50R15). Common metric sizes within half an inch of 31 in are 255/55R20 (31.0 in), 255/65R18 (31.1 in), 255/70R17 (31.1 in), 275/45R21 (30.7 in), 265/70R16 (30.6 in) and 265/65R17 (30.6 in). Real tires differ a little by model, so check the maker's published diameter.

31-inch tire sizes by wheel size

Every size in the maker data books we use whose calculated diameter is within ±0.5 in of 31 in, with the makers' published diameter.

15" (2)16" (2)17" (6)18" (4)19" (2)20" (4)21" (4)22" (5)23" (2)24" (1)

On 15-inch wheels

SizeCalculatedWidthPublished by makers
265/75R1530.6 in10.4 in30.7 in
31x10.50R1531.0 in10.5 in30.5–31.1 in

On 16-inch wheels

SizeCalculatedWidthPublished by makers
265/70R1630.6 in10.4 in30.6–30.7 in
275/70R1631.2 in10.8 in31.2 in

31-inch tires on 16-inch wheels

On 17-inch wheels

SizeCalculatedWidthPublished by makers
235/75R1730.9 in9.3 in30.8–31.1 in
245/70R1730.5 in9.6 in30.5–30.8 in
245/75R1731.5 in9.6 in31.4–31.9 in
255/70R1731.1 in10.0 in31.1–31.2 in
265/65R1730.6 in10.4 in30.5–31 in
275/65R1731.1 in10.8 in31.1 in

On 18-inch wheels

SizeCalculatedWidthPublished by makers
255/65R1831.1 in10.0 in30.8–31.1 in
265/60R1830.5 in10.4 in30.4–31 in
275/60R1831.0 in10.8 in31 in
285/60R1831.5 in11.2 in31.46–32 in

On 19-inch wheels

SizeCalculatedWidthPublished by makers
255/60R1931.0 in10.0 in30.9–31.1 in
275/55R1930.9 in10.8 in30.7–31.38 in

On 20-inch wheels

SizeCalculatedWidthPublished by makers
235/60R2031.1 in9.3 in31–31.1 in
255/55R2031.0 in10.0 in30.7–31.02 in
275/50R2030.8 in10.8 in30.6–31.1 in
285/50R2031.2 in11.2 in31–31.3 in

On 21-inch wheels

SizeCalculatedWidthPublished by makers
255/50R2131.0 in10.0 in31–31.1 in
275/45R2130.7 in10.8 in30.5–30.8 in
285/45R2131.1 in11.2 in30.9–31.1 in
315/40R2130.9 in12.4 in30.9 in

On 22-inch wheels

SizeCalculatedWidthPublished by makers
255/45R2231.0 in10.0 in31.1 in
275/40R2230.7 in10.8 in30.3–30.7 in
285/40R2231.0 in11.2 in30.98–31.2 in
295/40R2231.3 in11.6 in31.1–31.3 in
325/35R2231.0 in12.8 in30.98 in

On 23-inch wheels

SizeCalculatedWidthPublished by makers
285/35R2330.9 in11.2 in30.7 in
295/35R2331.1 in11.6 in30.8 in

On 24-inch wheels

SizeCalculatedWidthPublished by makers
295/30R2431.0 in11.6 in31 in

Check a size

Metric (265/70R17 or 2657017) or flotation (35x12.50R20)

Where do I find my size?

It's on the tire sidewall, e.g. P265/70R17 115T, and on the tire placard sticker on the driver's door jamb (also in the owner's manual). The placard shows the size the vehicle came with; the sidewall shows what is fitted now. If they differ, use the placard as your starting point. Digits are enough here: 2657017 or 33125020.

FAQ

What size is a 31 inch tire in metric?

A 31-inch tire is about 31 inches tall. In flotation sizing it is written 31x10.50 (followed by the wheel size, e.g. 31x10.50R15). Common metric sizes within half an inch of 31 in are 255/55R20 (31.0 in), 255/65R18 (31.1 in), 255/70R17 (31.1 in), 275/45R21 (30.7 in), 265/70R16 (30.6 in) and 265/65R17 (30.6 in).

Are all 31-inch tires exactly 31 inches tall?

No. The number is nominal. Maker data books list real 31-inch flotation tires a little under or over 31 in (often 0.5–1.5% under), and metric sizes near 31 in vary too. Compare published diameters before mixing sizes.

Other heights: 30-inch · 32-inch · 33-inch · 34-inch · 35-inch · 37-inch

Important: These are calculated (nominal) dimensions, not a fitment recommendation. Real tires of the same size differ by brand and model (makers allow about ±3% of section height), and width changes with the rim it is mounted on. The math can't see wheel width and offset, clearance at full steering lock and suspension travel, load index, speed rating, or what your vehicle maker approves. Before changing size, check your door-jamb placard and owner's manual and ask a tire professional. A replacement tire must meet or exceed the load index and speed rating on the placard.