245/40R20 tire size
A 245/40R20 tire is 27.72 inches (704.0 mm) tall, 9.65 in (245 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 27.7x9.6R20 — a "28-inch" tire.
| Overall diameter | 27.72 in | 704.0 mm |
|---|---|---|
| Section width | 9.65 in | 245 mm |
| Sidewall height | 3.86 in | 98.0 mm |
| Circumference | 87.07 in | 2,212 mm |
| Revolutions | 727.7 per mile | 452.1 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 245/40R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 245/40R20:
Plus and minus sizes for 245/40R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 225/55R18 | Minus 2 (18 in) | 27.74 in | +0.10% |
| 275/45R18 | Minus 2 (18 in) | 27.74 in | +0.10% |
| 245/50R18 | Minus 2 (18 in) | 27.65 in | −0.26% |
| 255/50R18 | Minus 2 (18 in) | 28.04 in | +1.16% |
| 245/45R19 | Minus 1 (19 in) | 27.68 in | −0.13% |
| 275/40R19 | Minus 1 (19 in) | 27.66 in | −0.20% |
| 225/50R19 | Minus 1 (19 in) | 27.86 in | +0.51% |
| 215/50R19 | Minus 1 (19 in) | 27.46 in | −0.91% |
| 285/30R21 | Plus 1 (21 in) | 27.73 in | +0.06% |
| 245/35R21 | Plus 1 (21 in) | 27.75 in | +0.13% |
| 275/30R21 | Plus 1 (21 in) | 27.50 in | −0.80% |
| 295/30R21 | Plus 1 (21 in) | 27.97 in | +0.91% |
Vehicles approved with 245/40R20 tires
Models whose Swiss type approval lists 245/40R20 as a standard or optional size (1,645 approvals in total). Always check your own vehicle's placard or papers.
- BMW 7 Series
- BMW 6 Series
- BMW 5 Series
- Mercedes-Benz S-Class
- Polestar 2
- Maserati Ghibli
- BMW X2
- Maserati Quattroporte
- Audi RS6
- Jaguar XJ
- BMW i8
- Opel Astra
- BMW X3
- MINI Countryman
- Opel Cascada
- DS DS4
- Peugeot 408
- Smart 3
- Mercedes-Benz E-Class
- Volvo EX30
- Volvo V60
- Volvo V90
- BMW X1
- MINI JCW
- Infiniti Q70
- Toyota C-HR
- Volvo S90
- BMW i5
- Hyundai Ioniq
- Lucid Air
- Aston Martin Rapide
- Chevrolet Camaro
- MG IM5
- Audi RS7
- BMW ActiveHybrid
- Genesis G80
- MG Cyberster
- Kia EV3
- Maserati Levante
- BYD Seal
Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.
Nearby 20-inch sizes
- 225/35R20 (−5.5%)
- 225/40R20 (−2.3%)
- 235/35R20 (−4.5%)
- 235/40R20 (−1.1%)
- 235/45R20 (+2.2%)
- 235/50R20 (+5.5%)
- 245/30R20 (−7.0%)
- 245/35R20 (−3.5%)
- 245/45R20 (+3.5%)
- 245/50R20 (+7.0%)
- 255/30R20 (−6.1%)
- 255/35R20 (−2.5%)
- 255/40R20 (+1.1%)
- 255/45R20 (+4.8%)
- 255/50R20 (+8.4%)
- 265/30R20 (−5.3%)
- 265/35R20 (−1.5%)
- 265/40R20 (+2.3%)
- 265/45R20 (+6.0%)
- 265/50R20 (+9.8%)
Reading the 245/40R20 size
- 245 — section width in millimetres (9.65 in).
- 40 — aspect ratio: the sidewall is 40 % of the width, 98.0 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 20 — fits a 20-inch diameter wheel.
The load index and speed rating (for example 91V) follow the size on the sidewall. They must meet at least the values on your vehicle's tire placard.