Metric tire size

225/45R17 tire size

A 225/45R17 tire is 25.0 inches (634 mm) tall and 8.9 in wide, for a 17-inch wheel, with a 4.0 in sidewall. That is the nominal size worked out from the code. Makers publish 24.7–25.2 in for real 225/45R17 tires (6 makers).

Diameter25.0 in634 mm

Width8.9 in225 mm

Sidewall4.0 in101 mm

Revs per mile808nominal, published 822–840

Wheel width7–8.5 inapproved by every listing

Compare 225/45R17 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 225/45R17 tires: published diameters

Figures from the makers' own data books. They differ from the 25.0 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	25–25.2 in	822–834	7–8.5 in	6
Goodyear	25 in	836–837	7–8.5 in	2
Hankook	24.7–25.2 in	835–840	7–8.5 in	8
Nitto	24.8–25.08 in	—	7–8.5 in	4
Toyo	25 in	832	7–8.5 in	1
Uniroyal	24.9 in	833	7–8.5 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 225/45R17. Same diameter is only one part of fitting a different size.

Wheel	Real sizes within 3% (closest first)
15-inch	195/65R15 (25.0 in, ±0.0%), 215/60R15 (25.2 in, +0.7%), 205/60R15 (24.7 in, −1.2%)
16-inch	205/55R16 (24.9 in, −0.4%), 225/50R16 (24.9 in, −0.5%), 185/60R16 (24.7 in, −0.9%)
17-inch	255/40R17 (25.0 in, +0.2%), 205/50R17 (25.1 in, +0.4%), 245/40R17 (24.7 in, −1.0%)
18-inch	295/30R18 (25.0 in, ±0.0%), 255/35R18 (25.0 in, +0.2%), 225/40R18 (25.1 in, +0.5%)
20-inch	225/30R20 (25.3 in, +1.4%), 275/25R20 (25.4 in, +1.8%), 235/30R20 (25.6 in, +2.3%)

Popular comparisons with 225/45R17

205/50R17 vs 225/45R17−0.4% diameter 215/55R17 vs 225/45R17−5.1% diameter 225/45R17 vs 215/45R17−1.4% diameter 225/45R17 vs 235/45R17+1.4% diameter

FAQ

How tall is a 225/45R17 tire?

25.0 inches (634 mm) calculated from the size code. Makers publish 24.7–25.2 in for real tires in this size; the difference comes from tread design and construction.

How do you work out the 225/45R17 diameter?

Sidewall = 225 mm × 45% = 101.2 mm. Diameter = 17 in wheel + 2 × 101.2 mm ÷ 25.4 = 24.97 in.

Is 225/45R17 a 25-inch tire?

It is about 25.0 in tall nominally, so it is close to 25 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 225/45R17?

Real sizes within 3% of its diameter include 205/55R16 (−0.4%), 295/30R18 (±0.0%) and 225/30R20 (+1.4%). 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 225/45R17 make?

About 808 calculated from its unloaded diameter. Makers publish 822–840 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.

Open 225/45R17 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.