245/45R20 tire size
A 245/45R20 tire is 245 mm wide with a 110.3 mm sidewall, 45% of the width, on a 20-inch rim, which puts the whole tire at 728.5 mm, or about 28.7 inches, tall. Our data lists 1 models fitted with it from the factory, mostly SUVs and crossovers.
Overall height
728.5 mm
28.7 in
Sidewall
110.3 mm
45%
Circumference
2,289 mm
Revs per km
437
Actual dimensions of 245/45R20
| Section width | 245 mm (9.6 in) |
| Sidewall height | 110.3 mm (4.34 in) |
| Rim diameter | 20 in (508.0 mm) |
| Overall diameter | 728.5 mm (28.7 in) |
| Circumference | 2,289 mm |
| Revolutions per km | 437 |
| Inch notation (height x width) | 28.7x9.6R20 |
Worked out: sidewall 245 x 0.45 = 110.25 mm, rim 20 x 25.4 = 508 mm, overall 508 + (110.25 x 2) = 728.5 mm, circumference 3.1416 x 728.5 = 2,289 mm. One turn of the tire moves the car about 2.29 m, which is 437 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 245/45R20 from the factory
Models whose Thai-market specification lists 245/45R20; the source column links to the spec we checked.
| Model | Years | Grades | Source |
|---|---|---|---|
| BYD Sealion 7 | 2025–present | AWD Performance | headlightmag.com |
Cars that can switch to 245/45R20
These cars leave the factory on another size within 3% of the height of 245/45R20. Whether it fits still depends on rim width and wheel-well clearance.
Sizes that can replace 245/45R20
Sizes within ±3% of the overall height of 245/45R20. “At 100 km/h” is the real speed when the speedometer reads 100.
| Size | Height | Difference | At 100 km/h | Sidewall | Match | Compare |
|---|---|---|---|---|---|---|
| 225/55R19 | 730.1 mm | +1.6 mm (+0.22%) | 100.2 km/h | 123.8 mm | Very close | Compare |
| 255/45R20 | 737.5 mm | +9.0 mm (+1.24%) | 101.2 km/h | 114.8 mm | Close | Compare |
| 255/50R19 | 737.6 mm | +9.1 mm (+1.25%) | 101.2 km/h | 127.5 mm | Close | Compare |
| 235/50R19 | 717.6 mm | −10.9 mm (−1.50%) | 98.5 km/h | 117.5 mm | Close | Compare |
| 235/55R19 | 741.1 mm | +12.6 mm (+1.73%) | 101.7 km/h | 129.3 mm | Close | Compare |
| 255/45R19 | 712.1 mm | −16.4 mm (−2.25%) | 97.7 km/h | 114.8 mm | Within range | Compare |
| 265/45R20 | 746.5 mm | +18.0 mm (+2.47%) | 102.5 km/h | 119.3 mm | Within range | Compare |
- Keeping your wheels, the closest is 255/45R20 at 737.5 mm, +9.0 mm (+1.24%) from the original. With the speedometer on 100 km/h, the car would actually be doing about 101.2 km/h. Ground clearance rises by about 4.5 mm.
- Going down to 19-inch wheels, 225/55R19 (+0.22%) is the closest match and raises the sidewall to 123.8 mm.
Buying 245/45R20 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 245/45R20
The code after the size on the sidewall, as in 245/45R20 99V, is the load index and speed symbol. The common ratings for this size:
| Version | Index | Per tire | Four tires |
|---|---|---|---|
| Standard load (SL) | 99 | 775 kg | 3,100 kg |
| Extra load (XL) | 103 | 875 kg | 3,500 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
245/45R20 questions
How tall is a 245/45R20 tire?
About 28.7 inches, or 728.5 mm, from top to bottom before it carries weight. Each sidewall is 110.3 mm tall and the tire is 245 mm (9.6 in) wide.
Which cars use 245/45R20 tires?
From Thai-market specifications, 245/45R20 comes on BYD Sealion 7.
Can I fit 255/45R20 instead of 245/45R20?
Size-wise, yes: the height differs by +1.24% (+9.0 mm), so an indicated 100 km/h is really about 101.2 km/h. The tread is 10 mm wider. Check rim width and load index first.
How much weight can a 245/45R20 tire carry?
Most standard-load versions carry load index 99: 775 kg per tire, 3,100 kg across four. XL versions are rated 103, or 875 kg per tire. Look for the number after the size on the sidewall, as in 245/45R20 99V.
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.