Metric tire size
245/50R20 tire size
A 245/50R20 tire is 29.6 inches (753 mm) tall and 9.6 in wide, for a 20-inch wheel, with a 4.8 in sidewall. That is the nominal size worked out from the code. Makers publish 29.4–29.8 in for real 245/50R20 tires (7 makers).
Compare 245/50R20 with other sizes
Set up for: comparing 245/50R20 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 245/50R20 tires: published diameters
Figures from the makers' own data books. They differ from the 29.6 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 | 29.6 in | 701 | 7–8.5 in | 1 |
| Falken | 29.7–29.8 in | 704–708 | 7–8.5 in | 3 |
| Goodyear | 29.7 in | 703–704 | 7–8.5 in | 2 |
| Hankook | 29.4–29.8 in | 697–706 | 7–8.5 in | 6 |
| Nitto | 29.69 in | — | 7–8.5 in | 1 |
| Toyo | 29.7 in | 700 | 7–8.5 in | 1 |
| Uniroyal | 29.6 in | 701 | 7–8.5 in | 1 |
Equivalent sizes on other wheels
Sizes that appear in the maker data books with a diameter within 3% of 245/50R20. Same diameter is only one part of fitting a different size.
| Wheel | Real sizes within 3% (closest first) |
|---|---|
| 15-inch | 265/70R15 , 30x9.50R15 , 255/70R15 |
| 16-inch | 245/70R16 , 235/75R16 , 225/75R16 |
| 17-inch | 245/65R17 , 265/60R17 , 235/70R17 |
| 18-inch | 245/60R18 , 235/65R18 , 255/60R18 |
| 20-inch | 305/40R20 , 275/45R20 , 265/45R20 |
| 22-inch | 275/35R22 , 315/30R22 , 285/35R22 |
Popular comparisons with 245/50R20
FAQ
How tall is a 245/50R20 tire?
29.6 inches (753 mm) calculated from the size code. Makers publish 29.4–29.8 in for real tires in this size; the difference comes from tread design and construction.
How do you work out the 245/50R20 diameter?
Sidewall = 245 mm × 50% = 122.5 mm. Diameter = 20 in wheel + 2 × 122.5 mm ÷ 25.4 = 29.65 in.
Is 245/50R20 a 30-inch tire?
It is about 29.6 in tall nominally, so it is close to 30 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 245/50R20?
Real sizes within 3% of its diameter include 245/70R16 (−0.5%), 245/65R17 (−0.4%) and 245/60R18 (−0.2%). 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 245/50R20 make?
About 680 calculated from its unloaded diameter. Makers publish 697–708 revs per mile, measured under load (a loaded tire rolls on a slightly smaller radius), which is why published figures are higher.
Open 245/50R20 in the converter · Tire size chart · 30-inch tires