255/50R20 tire size
A 255/50R20 tire is 255 mm wide with a 127.5 mm sidewall, 50% of the width, on a 20-inch rim, which puts the whole tire at 763.0 mm, or about 30.0 inches, tall. No model in our data leaves the factory on it, but it can replace the original size on 6 models within 3% of the height.
Overall height
763.0 mm
30.0 in
Sidewall
127.5 mm
50%
Circumference
2,397 mm
Revs per km
417
Actual dimensions of 255/50R20
| Section width | 255 mm (10.0 in) |
| Sidewall height | 127.5 mm (5.02 in) |
| Rim diameter | 20 in (508.0 mm) |
| Overall diameter | 763.0 mm (30.0 in) |
| Circumference | 2,397 mm |
| Revolutions per km | 417 |
| Inch notation (height x width) | 30.0x10.0R20 |
Worked out: sidewall 255 x 0.5 = 127.5 mm, rim 20 x 25.4 = 508 mm, overall 508 + (127.5 x 2) = 763.0 mm, circumference 3.1416 x 763.0 = 2,397 mm. One turn of the tire moves the car about 2.40 m, which is 417 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 255/50R20 from the factory
No model sold in Thailand in our data leaves the factory on 255/50R20.
Cars that can switch to 255/50R20
These cars leave the factory on another size within 3% of the height of 255/50R20. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| Isuzu MU-X2021–present | 265/50R20 | −1.29% | Same wheel |
| Nissan Navara2021–present | 255/60R18 | −0.03% | Needs 20-inch wheels |
| Nissan NP300 Navara2014–2020 | 255/60R18 | −0.03% | Needs 20-inch wheels |
| MG ExtenderCurrent model | 255/60R18 | −0.03% | Needs 20-inch wheels |
| Ford Everest2022–present | 275/45R21 | −2.29% | Needs 20-inch wheels |
| Honda CR-V2023–present | 235/55R19 | +2.96% | Needs 20-inch wheels |
Sizes that can replace 255/50R20
Sizes within ±3% of the overall height of 255/50R20. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 255/55R19 | 763.1 mm | +0.1 mm (+0.01%) | 100.0 km/h | 140.3 mm | Very close | Compare |
| 265/50R20 | 773.0 mm | +10.0 mm (+1.31%) | 101.3 km/h | 132.5 mm | Close | Compare |
| 245/55R19 | 752.1 mm | −10.9 mm (−1.43%) | 98.6 km/h | 134.8 mm | Close | Compare |
| 265/45R20 | 746.5 mm | −16.5 mm (−2.16%) | 97.8 km/h | 119.3 mm | Within range | Compare |
| 275/45R21 | 780.9 mm | +17.9 mm (+2.35%) | 102.3 km/h | 123.8 mm | Within range | Compare |
| 275/50R20 | 783.0 mm | +20.0 mm (+2.62%) | 102.6 km/h | 137.5 mm | Within range | Compare |
| 235/55R19 | 741.1 mm | −21.9 mm (−2.87%) | 97.1 km/h | 129.3 mm | Within range | Compare |
- Keeping your wheels, the closest is 265/50R20 at 773.0 mm, +10.0 mm (+1.31%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 101.3 km/h. Ground clearance rises by about 5.0 mm.
- Moving up to 21-inch wheels, the closest height match is 275/45R21 (+2.35%), with the sidewall dropping from 127.5 mm to 123.8 mm.
- Going down to 19-inch wheels, 255/55R19 (+0.01%) is the closest match and raises the sidewall to 140.3 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 255/50R20 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 255/50R20
The code after the size on the sidewall, as in 255/50R20 105S, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 105 | 925 kg | 3,700 kg |
| Extra load (XL) | 109 | 1,030 kg | 4,120 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
255/50R20 questions
How tall is a 255/50R20 tire?
About 30.0 inches, or 763.0 mm, from top to bottom before it carries weight. Each sidewall is 127.5 mm tall and the tire is 255 mm (10.0 in) wide.
Which cars use 255/50R20 tires?
No car in our data is fitted with 255/50R20 from the factory, but its height is close to the original size on Isuzu MU-X, Nissan Navara, Nissan NP300 Navara, MG Extender and Ford Everest, so it works as a replacement size.
Can I fit 265/50R20 instead of 255/50R20?
Size-wise, yes: the height differs by +1.31% (+10.0 mm), so an indicated 100 km/h is really about 101.3 km/h. The tread is 10 mm wider. Check rim width and load index first.
How much weight can a 255/50R20 tire carry?
Most standard-load versions carry load index 105: 925 kg per tire, 3,700 kg across four. XL versions are rated 109, or 1,030 kg per tire. Look for the number after the size on the sidewall, as in 255/50R20 105S.
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.