Metric tire size
255/40R19 tire size
A 255/40R19 tire is 27.0 inches (687 mm) tall and 10.0 in wide, for a 19-inch wheel, with a 4.0 in sidewall. That is the nominal size worked out from the code. Makers publish 26.6–27.3 in for real 255/40R19 tires (5 makers).
Compare 255/40R19 with other sizes
Set up for: comparing 255/40R19 with a size you're considering · Different situation?
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.
Size you're considering
Real 255/40R19 tires: published diameters
Figures from the makers' own data books. They differ from the 27.0 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 | 27–27.3 in | 763–768 | 8.5–10 in | 4 |
| Goodyear | 27–27.1 in | 773 | 8.5–10 in | 2 |
| Hankook | 26.6–26.9 in | 772–782 | 8.5–10 in | 5 |
| Nitto | 27.05 in | — | 8.5–10 in | 1 |
| Toyo | 27 in | 768 | 8.5–10 in | 1 |
Equivalent sizes on other wheels
Sizes that appear in the maker data books with a diameter within 3% of 255/40R19. Same diameter is only one part of fitting a different size.
| Wheel | Real sizes within 3% (closest first) |
|---|---|
| 15-inch | 255/60R15 , 205/75R15 , 215/70R15 |
| 16-inch | 215/65R16 , 235/60R16 , 205/70R16 |
| 17-inch | 255/50R17 , 215/60R17 , 235/55R17 |
| 18-inch | 255/45R18 , 285/40R18 , 225/50R18 |
| 20-inch | 255/35R20 , 225/40R20 , 295/30R20 |
| 22-inch | 235/30R22 , 245/30R22 , 295/25R22 |
Popular comparisons with 255/40R19
FAQ
How tall is a 255/40R19 tire?
27.0 inches (687 mm) calculated from the size code. Makers publish 26.6–27.3 in for real tires in this size; the difference comes from tread design and construction.
How do you work out the 255/40R19 diameter?
Sidewall = 255 mm × 40% = 102.0 mm. Diameter = 19 in wheel + 2 × 102.0 mm ÷ 25.4 = 27.03 in.
Is 255/40R19 a 27-inch tire?
It is about 27.0 in tall nominally, so it is close to 27 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 255/40R19?
Real sizes within 3% of its diameter include 215/65R16 (−0.1%), 255/50R17 (±0.0%), 255/45R18 (±0.0%) and 255/35R20 (±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 255/40R19 make?
About 746 calculated from its unloaded diameter. Makers publish 763–782 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.
Open 255/40R19 in the converter · Tire size chart