315/30R22 vs 315/35R21
315/35R21 is 6.0 mm taller than 315/30R22 in overall diameter (+0.8%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 315/35R21 fitted, the speedometer reads 100 km/h when you are doing 100.8 km/h.
Dimensions side by side
| 315/30R22 | 315/35R21 | |
|---|---|---|
| Overall diameter | 748 mm (29.4″) | 754 mm (29.7″) |
| Section width | 315 mm | 315 mm |
| Sidewall height | 95 mm | 110 mm |
| Rim | 22″ | 21″ |
| Revolutions per km | 426 | 422 |
| In stock | 9 tires from $480.00 | 10 tires from $322.00 |
What changes
- Overall diameter: 315/35R21 is 6.0 mm taller (+0.8%).
- Speedometer: reads 100 km/h at an actual 100.8 km/h with 315/35R21.
- Wheel size changes from 22″ to 21″: 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 315/30R22
Vehicles that use 315/35R21
See every alternate size for 315/30R22
Frequently asked questions
Can I use 315/35R21 instead of 315/30R22?
Usually, yes: 315/35R21 is within 3% of the overall diameter of 315/30R22 (+0.8%). 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 315/30R22 and 315/35R21?
With 315/35R21 instead of 315/30R22, the speedometer shows 100 km/h when you are actually doing 100.8 km/h.
Which vehicles came with both 315/30R22 and 315/35R21?
Both sizes were original equipment, on different trims or packages, on the 2019–2024 BMW X5, 2020–2024 BMW X6, 2019–2023 Porsche Cayenne.