255/45R19 tire size
A 255/45R19 tire is 255 mm wide with a 114.8 mm sidewall, 45% of the width, on a 19-inch rim, which puts the whole tire at 712.1 mm, or about 28.0 inches, tall. Our data lists 1 models fitted with it from the factory, mostly SUVs and crossovers.
Overall height
712.1 mm
28.0 in
Sidewall
114.8 mm
45%
Circumference
2,237 mm
Revs per km
447
Actual dimensions of 255/45R19
| Section width | 255 mm (10.0 in) |
| Sidewall height | 114.8 mm (4.52 in) |
| Rim diameter | 19 in (482.6 mm) |
| Overall diameter | 712.1 mm (28.0 in) |
| Circumference | 2,237 mm |
| Revolutions per km | 447 |
| Inch notation (height x width) | 28.0x10.0R19 |
Worked out: sidewall 255 x 0.45 = 114.75 mm, rim 19 x 25.4 = 482.6 mm, overall 482.6 + (114.75 x 2) = 712.1 mm, circumference 3.1416 x 712.1 = 2,237 mm. One turn of the tire moves the car about 2.24 m, which is 447 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 255/45R19 from the factory
Models whose Thai-market specification lists 255/45R19; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| BYD Sealion 7 | 2025–present | Premium (rear axle) | headlightmag.com |
Cars that can switch to 255/45R19
These cars leave the factory on another size within 3% of the height of 255/45R19. Whether it fits still depends on rim width and wheel-well clearance.
| Model | Factory size | Height difference | Wheel |
|---|---|---|---|
| BYD Sealion 6 DM-i2024–present | 235/50R19 | −0.77% | Same wheel |
| Mazda CX-52017–present | 225/55R19 | −2.47% | Same wheel |
| BYD Seal2023–present | 235/45R19 | +2.59% | Same wheel |
| MG HS / HS PHEVCurrent model | 235/50R18 | +2.87% | Needs 19-inch wheels |
| BYD ATTO 32022–present | 235/50R18 | +2.87% | Needs 19-inch wheels |
Sizes that can replace 255/45R19
Sizes within ±3% of the overall height of 255/45R19. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 235/55R18 | 715.7 mm | +3.6 mm (+0.51%) | 100.5 km/h | 129.3 mm | Close | Compare |
| 235/50R19 | 717.6 mm | +5.5 mm (+0.77%) | 100.8 km/h | 117.5 mm | Close | Compare |
| 225/55R18 | 704.7 mm | −7.4 mm (−1.04%) | 99.0 km/h | 123.8 mm | Close | Compare |
| 245/40R20 | 704.0 mm | −8.1 mm (−1.14%) | 98.9 km/h | 98.0 mm | Close | Compare |
| 245/45R19 | 703.1 mm | −9.0 mm (−1.26%) | 98.7 km/h | 110.3 mm | Close | Compare |
| 245/50R18 | 702.2 mm | −9.9 mm (−1.39%) | 98.6 km/h | 122.5 mm | Close | Compare |
| 225/60R18 | 727.2 mm | +15.1 mm (+2.12%) | 102.1 km/h | 135.0 mm | Within range | Compare |
| 245/45R20 | 728.5 mm | +16.4 mm (+2.30%) | 102.3 km/h | 110.3 mm | Within range | Compare |
- Keeping your wheels, the closest is 235/50R19 at 717.6 mm, +5.5 mm (+0.77%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 100.8 km/h. Ground clearance rises by about 2.8 mm.
- Moving up to 20-inch wheels, the closest height match is 245/40R20 (−1.14%), with the sidewall dropping from 114.8 mm to 98.0 mm.
- Going down to 18-inch wheels, 235/55R18 (+0.51%) is the closest match and raises the sidewall to 129.3 mm.
- A larger or wider tire also changes acceleration, fuel use and steering weight, so look beyond the percentage.
Buying 255/45R19 tires
EVs are heavy and deliver torque instantly, so EV tires are often XL-rated and some carry noise-cutting foam, which puts them above standard tires in price.
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 255/45R19
The code after the size on the sidewall, as in 255/45R19 100V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 100 | 800 kg | 3,200 kg |
| Extra load (XL) | 104 | 900 kg | 3,600 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
V
240 km/h
W
270 km/h
255/45R19 questions
How tall is a 255/45R19 tire?
About 28.0 inches, or 712.1 mm, from top to bottom before it carries weight. Each sidewall is 114.8 mm tall and the tire is 255 mm (10.0 in) wide.
Which cars use 255/45R19 tires?
From Thai-market specifications, 255/45R19 comes on BYD Sealion 7.
Can I fit 235/50R19 instead of 255/45R19?
Size-wise, yes: the height differs by +0.77% (+5.5 mm), so an indicated 100 km/h is really about 100.8 km/h. The tread is 20 mm narrower. Check rim width and load index first.
How much weight can a 255/45R19 tire carry?
Most standard-load versions carry load index 100: 800 kg per tire, 3,200 kg across four. XL versions are rated 104, or 900 kg per tire. Look for the number after the size on the sidewall, as in 255/45R19 100V.
Other 19-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.