Metric tire size

255/80R17 tire size

A 255/80R17 tire is 33.1 inches (840 mm) tall and 10.0 in wide, for a 17-inch wheel, with a 8.0 in sidewall. That is the nominal size worked out from the code. Makers publish 33–33.31 in for real 255/80R17 tires (5 makers).

Diameter33.1 in840 mm
Width10.0 in255 mm
Sidewall8.0 in204 mm
Revs per mile610nominal, published 624–633
Wheel width6.5–8.5 inapproved by every listing

Compare 255/80R17 with other sizes

Set up for: comparing 255/80R17 with a size you're considering · Different situation?

1

Your current 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). 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.

2

Size you're considering

 

 

Real 255/80R17 tires: published diameters

Figures from the makers' own data books. They differ from the 33.1 in calculated figure because each tread design and construction measures slightly differently.

Maker (data book)Published diameterRevs per mileApproved wheel widthListings
Falken33–33.3 in627–6326.5–8.5 in2
Goodyear33.3 in6246.5–8.5 in1
Hankook33 in6336.5–8.5 in1
Nitto33.07–33.31 in—6.5–8.5 in2
Toyo33.1–33.3 in624–6286.5–8.5 in2

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 255/80R17. Same diameter is only one part of fitting a different size.

WheelReal sizes within 3% (closest first)
15-inch33x10.50R15 (33.0 in, −0.2%), 33x12.50R15 (33.0 in, −0.2%), 33x13.50R15 (33.0 in, −0.2%)
16-inch255/85R16 (33.1 in, ±0.0%), 285/75R16 (32.8 in, −0.7%), 305/70R16 (32.8 in, −0.8%)
17-inch33x11.50R17 (33.0 in, −0.2%), 33x12.50R17 (33.0 in, −0.2%), 295/70R17 (33.3 in, +0.6%)
18-inch295/65R18 (33.1 in, +0.1%), 33x11.50R18 (33.0 in, −0.2%), 33x12.50R18 (33.0 in, −0.2%)
20-inch33x11.50R20 (33.0 in, −0.2%), 33x12.50R20 (33.0 in, −0.2%), 275/60R20 (33.0 in, −0.2%)
22-inch33x12.50R22 (33.0 in, −0.2%), 315/45R22 (33.2 in, +0.3%), 355/40R22 (33.2 in, +0.4%)

Popular comparisons with 255/80R17

255/80R17 vs 285/70R17−1.1% diameter

FAQ

How tall is a 255/80R17 tire?

33.1 inches (840 mm) calculated from the size code. Makers publish 33–33.31 in for real tires in this size; the difference comes from tread design and construction.

How do you work out the 255/80R17 diameter?

Sidewall = 255 mm × 80% = 204.0 mm. Diameter = 17 in wheel + 2 × 204.0 mm ÷ 25.4 = 33.06 in.

Is 255/80R17 a 33-inch tire?

It is about 33.1 in tall nominally, so it is close to 33 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 255/80R17?

Real sizes within 3% of its diameter include 255/85R16 (±0.0%), 295/65R18 (+0.1%) and 33x11.50R20 (−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 255/80R17 make?

About 610 calculated from its unloaded diameter. Makers publish 624–633 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.

Open 255/80R17 in the converter · Tire size chart · 33-inch tires

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.