295/35R21 vs 295/40R20
295/40R20 is 4.0 mm taller than 295/35R21 in overall diameter (+0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 295/40R20 fitted, the speedometer reads 100 km/h when you are doing 100.5 km/h.
Dimensions side by side
| 295/35R21 | 295/40R20 | |
|---|---|---|
| Overall diameter | 740 mm (29.1″) | 744 mm (29.3″) |
| Section width | 295 mm | 295 mm |
| Sidewall height | 103 mm | 118 mm |
| Rim | 21″ | 20″ |
| Revolutions per km | 430 | 428 |
| In stock | 21 tires from $319.00 | 12 tires from $309.00 |
What changes
- Overall diameter: 295/40R20 is 4.0 mm taller (+0.5%).
- Speedometer: reads 100 km/h at an actual 100.5 km/h with 295/40R20.
- Wheel size changes from 21″ to 20″: you need wheels in the new size.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 295/35R21
Vehicles that use 295/40R20
See every alternate size for 295/35R21
Frequently asked questions
Can I use 295/40R20 instead of 295/35R21?
Usually, yes: 295/40R20 is within 3% of the overall diameter of 295/35R21 (+0.5%). 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 295/35R21 and 295/40R20?
With 295/40R20 instead of 295/35R21, the speedometer shows 100 km/h when you are actually doing 100.5 km/h.
Which vehicles came with both 295/35R21 and 295/40R20?
Both sizes were original equipment, on different trims or packages, on the 2015–2024 Porsche Macan, 2023–2024 Maserati Grecale, 2017–2023 Maserati Levante, 2018–2021 Mercedes-Benz GLC 63, 2018–2021 Mercedes-Benz GLC 63 S, 2009–2013 Mercedes-Benz ML63.