265/35R21 vs 265/40R20
265/40R20 is 1.0 mm taller than 265/35R21 in overall diameter (+0.1%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 265/40R20 fitted, the speedometer reads 100 km/h when you are doing 100.1 km/h.
Dimensions side by side
| 265/35R21 | 265/40R20 | |
|---|---|---|
| Overall diameter | 719 mm (28.3″) | 720 mm (28.3″) |
| Section width | 265 mm | 265 mm |
| Sidewall height | 93 mm | 106 mm |
| Rim | 21″ | 20″ |
| Revolutions per km | 443 | 442 |
| In stock | 12 tires from $372.00 | 8 tires from $320.00 |
What changes
- Overall diameter: 265/40R20 is 1.0 mm taller (+0.1%).
- Speedometer: reads 100 km/h at an actual 100.1 km/h with 265/40R20.
- 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 265/35R21
Vehicles that use 265/40R20
See every alternate size for 265/35R21
Frequently asked questions
Can I use 265/40R20 instead of 265/35R21?
Usually, yes: 265/40R20 is within 3% of the overall diameter of 265/35R21 (+0.1%). 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 265/35R21 and 265/40R20?
With 265/40R20 instead of 265/35R21, the speedometer shows 100 km/h when you are actually doing 100.1 km/h.
Which vehicles came with both 265/35R21 and 265/40R20?
Both sizes were original equipment, on different trims or packages, on the 2022–2024 Lucid Air, 2020–2024 Audi S8, 2021–2024 Audi A8, 2023–2024 Mercedes-Benz EQE.