Tire sizes by height

What size is a 30-inch tire?

A 30-inch tire is about 30 inches tall. In flotation sizing it is written 30x9.50 (followed by the wheel size, e.g. 30x9.50R15). Common metric sizes within half an inch of 30 in are 235/65R18 (30.0 in), 255/50R20 (30.0 in), 255/55R19 (30.0 in), 255/60R18 (30.0 in), 255/65R17 (30.1 in) and 235/55R20 (30.2 in). Real tires differ a little by model, so check the maker's published diameter.

30-inch tire sizes by wheel size

Every size in the maker data books we use whose calculated diameter is within ±0.5 in of 30 in, with the makers' published diameter.

15" (2)16" (5)17" (6)18" (3)19" (3)20" (8)21" (8)22" (5)

On 15-inch wheels

Size	Calculated	Width	Published by makers
30x9.50R15	30.0 in	9.5 in	29.5–30 in
265/70R15	29.6 in	10.4 in	29.6 in

On 16-inch wheels

Size	Calculated	Width	Published by makers
215/85R16	30.4 in	8.5 in	30.3–30.7 in
235/75R16	29.9 in	9.3 in	29.8–29.9 in
245/70R16	29.5 in	9.6 in	29.5–29.6 in
245/75R16	30.5 in	9.6 in	30.3–30.8 in
255/70R16	30.1 in	10.0 in	29.9–30.1 in

On 17-inch wheels

Size	Calculated	Width	Published by makers
225/75R17	30.3 in	8.9 in	30.2–30.3 in
235/70R17	30.0 in	9.3 in	30 in
245/65R17	29.5 in	9.6 in	29.2–29.6 in
255/65R17	30.1 in	10.0 in	30–30.1 in
265/60R17	29.5 in	10.4 in	29.5 in
275/60R17	30.0 in	10.8 in	30 in

On 18-inch wheels

Size	Calculated	Width	Published by makers
235/65R18	30.0 in	9.3 in	29.8–30.2 in
245/60R18	29.6 in	9.6 in	29.4–29.7 in
255/60R18	30.0 in	10.0 in	29.9–30.1 in

On 19-inch wheels

Size	Calculated	Width	Published by makers
245/55R19	29.6 in	9.6 in	29.5–29.8 in
255/55R19	30.0 in	10.0 in	29.9–30.3 in
265/55R19	30.5 in	10.4 in	30.2–30.5 in

On 20-inch wheels

Size	Calculated	Width	Published by makers
235/55R20	30.2 in	9.3 in	29.9–30.2 in
245/50R20	29.6 in	9.6 in	29.4–29.8 in
255/50R20	30.0 in	10.0 in	29.8–30.2 in
265/50R20	30.4 in	10.4 in	30.2–30.6 in
275/45R20	29.7 in	10.8 in	29.5–30.1 in
285/45R20	30.1 in	11.2 in	29.8–30.1 in
295/45R20	30.5 in	11.6 in	30.3–30.6 in
305/40R20	29.6 in	12.0 in	29.4–29.7 in

On 21-inch wheels

Size	Calculated	Width	Published by makers
235/50R21	30.3 in	9.3 in	30.3 in
245/45R21	29.7 in	9.6 in	29.1 in
255/45R21	30.0 in	10.0 in	30 in
265/45R21	30.4 in	10.4 in	30.2–30.4 in
275/40R21	29.7 in	10.8 in	29.3–29.6 in
285/40R21	30.0 in	11.2 in	29.7–30 in
295/40R21	30.3 in	11.6 in	30.1–30.3 in
315/35R21	29.7 in	12.4 in	29.3–29.6 in

On 22-inch wheels

Size	Calculated	Width	Published by makers
255/40R22	30.0 in	10.0 in	29.8–29.9 in
265/40R22	30.3 in	10.4 in	30.1–30.4 in
275/35R22	29.6 in	10.8 in	29.57–29.6 in
285/35R22	29.9 in	11.2 in	29.7–30 in
295/35R22	30.1 in	11.6 in	30.1 in

Check a size

Tire 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 30 inch tire in metric?

Are all 30-inch tires exactly 30 inches tall?

No. The number is nominal. Maker data books list real 30-inch flotation tires a little under or over 30 in (often 0.5–1.5% under), and metric sizes near 30 in vary too. Compare published diameters before mixing sizes.

Other heights: 31-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.