Metric tire size

275/40R17 tire size

A 275/40R17 tire is 25.7 inches (652 mm) tall and 10.8 in wide, for a 17-inch wheel, with a 4.3 in sidewall. That is the nominal size worked out from the code. Makers publish 25.55–25.8 in for real 275/40R17 tires (5 makers).

Diameter25.7 in652 mm

Width10.8 in275 mm

Sidewall4.3 in110 mm

Revs per mile786nominal, published 805–813

Wheel width9–11 inapproved by every listing

Compare 275/40R17 with other sizes

Your current size

Current tire size

e.g. 265/70R17, 2657017 or 33x12.50R20

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). If your current tires aren't the original size, the placard shows what the vehicle came with. Digits are enough here: 2657017 or 33125020.

Size you're considering

Size you're considering (2)

Real 275/40R17 tires: published diameters

Figures from the makers' own data books. They differ from the 25.7 in calculated figure because each tread design and construction measures slightly differently.

Maker (data book)	Published diameter	Revs per mile	Approved wheel width	Listings
BFGoodrich	25.6 in	810	9–11 in	1
Falken	25.6–25.7 in	806–813	9–11 in	3
Nitto	25.55–25.67 in	—	9–11 in	3
Toyo	25.6–25.8 in	805–811	9–11 in	3
Uniroyal	25.6 in	810	9–11 in	1

Sources: maker data books (PDF), checked 2026-11-05. Brand names identify the data source only.

Equivalent sizes on other wheels

Sizes that appear in the maker data books with a diameter within 3% of 275/40R17. Same diameter is only one part of fitting a different size.

Wheel	Real sizes within 3% (closest first)
15-inch	275/50R15 (25.8 in, +0.6%), 205/65R15 (25.5 in, −0.7%), 265/50R15 (25.4 in, −0.9%)
16-inch	245/50R16 (25.6 in, −0.1%), 205/60R16 (25.7 in, +0.1%), 225/55R16 (25.7 in, +0.3%)
17-inch	245/45R17 (25.7 in, +0.1%), 315/35R17 (25.7 in, +0.1%), 215/50R17 (25.5 in, −0.8%)
18-inch	195/50R18 (25.7 in, +0.1%), 215/45R18 (25.6 in, −0.2%), 245/40R18 (25.7 in, +0.2%)
20-inch	285/25R20 (25.6 in, −0.2%), 235/30R20 (25.6 in, −0.4%), 245/30R20 (25.8 in, +0.5%)

Popular comparisons with 275/40R17

245/45R17 vs 275/40R17−0.1% diameter

FAQ

How tall is a 275/40R17 tire?

25.7 inches (652 mm) calculated from the size code. Makers publish 25.55–25.8 in for real tires in this size; the difference comes from tread design and construction.

How do you work out the 275/40R17 diameter?

Sidewall = 275 mm × 40% = 110.0 mm. Diameter = 17 in wheel + 2 × 110.0 mm ÷ 25.4 = 25.66 in.

Is 275/40R17 a 26-inch tire?

It is about 25.7 in tall nominally, so it is close to 26 inches. Real tires in a size vary slightly by model; check the maker's spec sheet for the exact tire.

What sizes are equivalent to 275/40R17?

Real sizes within 3% of its diameter include 245/50R16 (−0.1%), 195/50R18 (+0.1%) and 285/25R20 (−0.2%). Equal diameter alone doesn't make a size suitable: wheel width, offset, clearance and load rating all matter.

How many revolutions per mile does a 275/40R17 make?

About 786 calculated from its unloaded diameter. Makers publish 805–813 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.

Open 275/40R17 in the converter · Tire size chart

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.