Metric tire size

245/45R19 tire size

A 245/45R19 tire is 27.7 inches (703 mm) tall and 9.6 in wide, for a 19-inch wheel, with a 4.3 in sidewall. That is the nominal size worked out from the code. Makers publish 27.4–27.9 in for real 245/45R19 tires (7 makers).

Diameter27.7 in703 mm

Width9.6 in245 mm

Sidewall4.3 in110 mm

Revs per mile729nominal, published 747–759

Wheel width7.5–9 inapproved by every listing

Compare 245/45R19 with other sizes

Set up for: comparing 245/45R19 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 245/45R19 tires: published diameters

Figures from the makers' own data books. They differ from the 27.7 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	27.6 in	751	7.5–9 in	1
Falken	27.6–27.9 in	747–752	7.5–9 in	4
Goodyear	27.7 in	755	7.5–9 in	1
Hankook	27.4–27.6 in	752–759	7.5–9 in	8
Nitto	27.68 in	—	7.5–9 in	1
Toyo	27.7 in	751	7.5–9 in	1
Uniroyal	27.6 in	751	7.5–9 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 245/45R19. Same diameter is only one part of fitting a different size.

Wheel	Real sizes within 3% (closest first)
15-inch	215/75R15 (27.7 in, +0.1%), 325/50R15 (27.8 in, +0.4%), 235/70R15 (28.0 in, +1.0%)
16-inch	195/75R16 (27.5 in, −0.6%), 225/65R16 (27.5 in, −0.6%), 215/70R16 (27.9 in, +0.6%)
17-inch	225/60R17 (27.6 in, −0.2%), 305/45R17 (27.8 in, +0.5%), 275/50R17 (27.8 in, +0.5%)
18-inch	245/50R18 (27.6 in, −0.1%), 225/55R18 (27.7 in, +0.2%), 305/40R18 (27.6 in, −0.3%)
20-inch	325/30R20 (27.7 in, ±0.0%), 245/40R20 (27.7 in, +0.1%), 275/35R20 (27.6 in, −0.4%)
22-inch	245/30R22 (27.8 in, +0.4%), 295/25R22 (27.8 in, +0.5%), 235/30R22 (27.6 in, −0.5%)

Popular comparisons with 245/45R19

235/50R19 vs 245/45R19−2.0% diameter 245/45R19 vs 255/40R19−2.3% diameter

FAQ

How tall is a 245/45R19 tire?

27.7 inches (703 mm) calculated from the size code. Makers publish 27.4–27.9 in for real tires in this size; the difference comes from tread design and construction.

How do you work out the 245/45R19 diameter?

Sidewall = 245 mm × 45% = 110.2 mm. Diameter = 19 in wheel + 2 × 110.2 mm ÷ 25.4 = 27.68 in.

Is 245/45R19 a 28-inch tire?

It is about 27.7 in tall nominally, so it is close to 28 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 245/45R19?

Real sizes within 3% of its diameter include 195/75R16 (−0.6%), 225/60R17 (−0.2%), 245/50R18 (−0.1%) and 325/30R20 (±0.0%). 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 245/45R19 make?

About 729 calculated from its unloaded diameter. Makers publish 747–759 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.

Open 245/45R19 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.