Metric tire size

315/70R17 tire size

A 315/70R17 tire is 34.4 inches (873 mm) tall and 12.4 in wide, for a 17-inch wheel, with a 8.7 in sidewall. That is the nominal size worked out from the code. Makers publish 34.4–34.7 in for real 315/70R17 tires (5 makers).

Diameter34.4 in873 mm

Width12.4 in315 mm

Sidewall8.7 in220 mm

Revs per mile587nominal, published 600–608

Wheel width8.5–10 inapproved by every listing

Compare 315/70R17 with other sizes

Set up for: comparing 315/70R17 with a size you're considering · Different situation?

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). 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.

Size you're considering

Size you're considering (2)

Real 315/70R17 tires: published diameters

Figures from the makers' own data books. They differ from the 34.4 in calculated figure because each tread design and construction measures slightly differently.

Maker (data book)	Published diameter	Revs per mile	Approved wheel width	Listings
Falken	34.6–34.7 in	602–604	8–11 in	2
Goodyear	34.4 in	607	8.5–10 in	1
Hankook	34.4–34.6 in	605–608	8–10.5 in	2
Nitto	34.41–34.61 in	—	8–10.5 in	2
Toyo	34.4–34.6 in	600–604	8–11 in	2

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 315/70R17. Same diameter is only one part of fitting a different size.

Wheel	Real sizes within 3% (closest first)
15-inch	35x12.50R15 (35.0 in, +1.9%), 35x13.50R15 (35.0 in, +1.9%), 35x14.50R15 (35.0 in, +1.9%)
16-inch	315/75R16 (34.6 in, +0.7%), 35x11.50R16 (35.0 in, +1.9%), 295/75R16 (33.4 in, −2.7%)
17-inch	285/75R17 (33.8 in, −1.5%), 305/70R17 (33.8 in, −1.6%), 35x11.50R17 (35.0 in, +1.9%)
18-inch	295/70R18 (34.3 in, −0.3%), 325/65R18 (34.6 in, +0.8%), 305/70R18 (34.8 in, +1.3%)
20-inch	285/65R20 (34.6 in, +0.7%), 275/65R20 (34.1 in, −0.8%), 34x11.50R20 (34.0 in, −1.1%)
22-inch	285/55R22 (34.3 in, −0.1%), 305/50R22 (34.0 in, −1.0%), 295/55R22 (34.8 in, +1.2%)

Popular comparisons with 315/70R17

315/70R17 vs 35x12.50R17+1.9% diameter 315/70R17 vs 37x12.50R17+7.7% diameter 285/70R17 vs 315/70R17+5.1% diameter 315/70R17 vs 33x12.50R17−4.0% diameter 315/70R17 vs 35x11.50R17+1.9% diameter

FAQ

How tall is a 315/70R17 tire?

34.4 inches (873 mm) calculated from the size code. Makers publish 34.4–34.7 in for real tires in this size; the difference comes from tread design and construction.

How do you work out the 315/70R17 diameter?

Sidewall = 315 mm × 70% = 220.5 mm. Diameter = 17 in wheel + 2 × 220.5 mm ÷ 25.4 = 34.36 in.

Is 315/70R17 a 34-inch tire?

It is about 34.4 in tall nominally, so it is close to 34 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 315/70R17?

Real sizes within 3% of its diameter include 315/75R16 (+0.7%), 295/70R18 (−0.3%) and 285/65R20 (+0.7%). 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 315/70R17 make?

About 587 calculated from its unloaded diameter. Makers publish 600–608 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.

Open 315/70R17 in the converter · Tire size chart · 34-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.