255/55R20 tire size
A 255/55R20 tire is 255 mm wide with a 140.3 mm sidewall, 55% of the width, on a 20-inch rim, which puts the whole tire at 788.5 mm, or about 31.0 inches, tall. Our data lists 1 models fitted with it from the factory, mostly PPV SUVs.
Overall height
788.5 mm
31.0 in
Sidewall
140.3 mm
55%
Circumference
2,477 mm
Revs per km
404
Actual dimensions of 255/55R20
| Section width | 255 mm (10.0 in) |
| Sidewall height | 140.3 mm (5.52 in) |
| Rim diameter | 20 in (508.0 mm) |
| Overall diameter | 788.5 mm (31.0 in) |
| Circumference | 2,477 mm |
| Revolutions per km | 404 |
| Inch notation (height x width) | 31.0x10.0R20 |
Worked out: sidewall 255 x 0.55 = 140.25 mm, rim 20 x 25.4 = 508 mm, overall 508 + (140.25 x 2) = 788.5 mm, circumference 3.1416 x 788.5 = 2,477 mm. One turn of the tire moves the car about 2.48 m, which is 404 turns per kilometer. New to sidewall codes? See how to read a tire size.
These are nominal figures from the standard formula. Real tires vary slightly by brand and squat a little under the weight of the car.
Cars fitted with 255/55R20 from the factory
Models whose Thai-market specification lists 255/55R20; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| Ford Everest | 2022–present | Titanium+, Sport, Platinum 2.0 | headlightmag.com |
Cars that can switch to 255/55R20
These cars leave the factory on another size within 3% of the height of 255/55R20. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| Isuzu MU-X2021–present | 265/50R20 | +2.01% | Same wheel |
| Toyota Fortuner2015–present | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Toyota Hilux Revo2015–2025 | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Toyota Hilux TRAVO2025–present | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Isuzu D-Max2020–present | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Mitsubishi Pajero Sport2015–present | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Mitsubishi Triton2024–present | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Mitsubishi Triton2015–2023 | 265/60R18 | +1.72% | Needs 20-inch wheels |
| Ford Ranger2015–2021 | 265/60R18 | +1.72% | Needs 20-inch wheels |
Sizes that can replace 255/55R20
Sizes within ±3% of the overall height of 255/55R20. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 285/50R20 | 793.0 mm | +4.5 mm (+0.57%) | 100.6 km/h | 142.5 mm | Close | Compare |
| 275/50R20 | 783.0 mm | −5.5 mm (−0.70%) | 99.3 km/h | 137.5 mm | Close | Compare |
| 275/45R21 | 780.9 mm | −7.6 mm (−0.96%) | 99.0 km/h | 123.8 mm | Close | Compare |
| 265/50R20 | 773.0 mm | −15.5 mm (−1.97%) | 98.0 km/h | 132.5 mm | Close | Compare |
| 275/55R20 | 810.5 mm | +22.0 mm (+2.79%) | 102.8 km/h | 151.3 mm | Within range | Compare |
- Keeping your wheels, the closest is 285/50R20 at 793.0 mm, +4.5 mm (+0.57%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 100.6 km/h. Ground clearance rises by about 2.3 mm.
- Moving up to 21-inch wheels, the closest height match is 275/45R21 (−0.96%), with the sidewall dropping from 140.3 mm to 123.8 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 255/55R20 tires
Pickup sizes like this come in quieter, softer H/T tread for paved roads and A/T tread for gravel, which costs more and is noisier. Choose for the roads you actually drive.
Check the production date in the DOT code before paying.
Check current prices
Search by brand
Links open marketplace search results; prices change constantly and not every brand makes this size.
Load index and speed rating for 255/55R20
The code after the size on the sidewall, as in 255/55R20 107S, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 107 | 975 kg | 3,900 kg |
| Extra load (XL) | 110 | 1,060 kg | 4,240 kg |
The new tire's load index and speed symbol must be no lower than the door placard, and it only carries its rated load at the correct pressure.
Common speed symbols in this size
S
180 km/h
T
190 km/h
H
210 km/h
255/55R20 questions
How tall is a 255/55R20 tire?
About 31.0 inches, or 788.5 mm, from top to bottom before it carries weight. Each sidewall is 140.3 mm tall and the tire is 255 mm (10.0 in) wide.
Which cars use 255/55R20 tires?
From Thai-market specifications, 255/55R20 comes on Ford Everest.
Can I fit 285/50R20 instead of 255/55R20?
Size-wise, yes: the height differs by +0.57% (+4.5 mm), so an indicated 100 km/h is really about 100.6 km/h. The tread is 30 mm wider. Check rim width and load index first.
How much weight can a 255/55R20 tire carry?
Most standard-load versions carry load index 107: 975 kg per tire, 3,900 kg across four. XL versions are rated 110, or 1,060 kg per tire. Look for the number after the size on the sidewall, as in 255/55R20 107S.
Other 20-inch sizes
To compare other sizes yourself, use the tire size calculator; changing rim size, try plus/minus sizing; and see speedometer error by speed.