Metric tire size
275/55R20 tire size
A 275/55R20 tire is 31.9 inches (810 mm) tall and 10.8 in wide, for a 20-inch wheel, with a 6.0 in sidewall. That is the nominal size worked out from the code. Makers publish 31.8–32.13 in for real 275/55R20 tires (7 makers).
Compare 275/55R20 with other sizes
Set up for: comparing 275/55R20 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 275/55R20 tires: published diameters
Figures from the makers' own data books. They differ from the 31.9 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 | 31.8–31.9 in | 652 | 7.5–9.5 in | 2 |
| Falken | 31.9–32.1 in | 648–662 | 7.5–9.5 in | 5 |
| Goodyear | 31.9–32.1 in | 647–655 | 7.5–9.5 in | 3 |
| Hankook | 31.8–32.1 in | 647–656 | 7.5–9.5 in | 7 |
| Nitto | 31.89–32.13 in | — | 7.5–9.5 in | 2 |
| Toyo | 31.9–32.1 in | 647–651 | 7.5–9.5 in | 2 |
| Uniroyal | 31.9 in | 652 | 7.5–9.5 in | 1 |
Equivalent sizes on other wheels
Sizes that appear in the maker data books with a diameter within 3% of 275/55R20. Same diameter is only one part of fitting a different size.
| Wheel | Real sizes within 3% (closest first) |
|---|---|
| 15-inch | 32x11.50R15 , 32x9.50R15 , 31x10.50R15 |
| 16-inch | 235/85R16 , 285/70R16 , 265/75R16 |
| 17-inch | 315/60R17 , 235/80R17 , 255/75R17 |
| 18-inch | 255/70R18 , 275/65R18 , 265/65R18 |
| 20-inch | 305/50R20 , 255/60R20 , 245/60R20 |
| 22-inch | 275/45R22 , 285/45R22 , 305/40R22 |
Popular comparisons with 275/55R20
FAQ
How tall is a 275/55R20 tire?
31.9 inches (810 mm) calculated from the size code. Makers publish 31.8–32.13 in for real tires in this size; the difference comes from tread design and construction.
How do you work out the 275/55R20 diameter?
Sidewall = 275 mm × 55% = 151.2 mm. Diameter = 20 in wheel + 2 × 151.2 mm ÷ 25.4 = 31.91 in.
Is 275/55R20 a 32-inch tire?
It is about 31.9 in tall nominally, so it is close to 32 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 275/55R20?
Real sizes within 3% of its diameter include 235/85R16 (−0.6%), 315/60R17 (−0.1%) and 255/70R18 (+0.5%). 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 275/55R20 make?
About 632 calculated from its unloaded diameter. Makers publish 647–662 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.
Open 275/55R20 in the converter · Tire size chart · 32-inch tires