245/35R20 vs 305/30R20
305/30R20 is 11.0 mm taller than 245/35R20 in overall diameter (+1.6%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 305/30R20 fitted, the speedometer reads 100 km/h when you are doing 101.6 km/h.
Dimensions side by side
| 245/35R20 | 305/30R20 | |
|---|---|---|
| Overall diameter | 680 mm (26.8″) | 691 mm (27.2″) |
| Section width | 245 mm | 305 mm |
| Sidewall height | 86 mm | 92 mm |
| Rim | 20″ | 20″ |
| Revolutions per km | 468 | 461 |
| In stock | 23 tires from $129.00 | 11 tires from $421.00 |
What changes
- Overall diameter: 305/30R20 is 11.0 mm taller (+1.6%).
- Speedometer: reads 100 km/h at an actual 101.6 km/h with 305/30R20.
- 305/30R20 is 60 mm wider, so check clearance and the recommended rim width.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 245/35R20
Vehicles that use 305/30R20
See every alternate size for 245/35R20
Frequently asked questions
Can I use 305/30R20 instead of 245/35R20?
Usually, yes: 305/30R20 is within 3% of the overall diameter of 245/35R20 (+1.6%). Use wheels of the right size and width, match or exceed the original load index, and check clearance at full steering lock.
How much does the speedometer change between 245/35R20 and 305/30R20?
With 305/30R20 instead of 245/35R20, the speedometer shows 100 km/h when you are actually doing 101.6 km/h.
Which vehicles came with both 245/35R20 and 305/30R20?
Both sizes were original equipment, on different trims or packages, on the 2022–2024 Maserati MC20, 2020–2023 Ferrari F8, 2016–2020 Ferrari 488, 2013–2019 Porsche 911, 2014–2015 Ferrari 458.