275/35R22 vs 305/35R21
305/35R21 is 4.0 mm shorter than 275/35R22 in overall diameter (−0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 305/35R21 fitted, the speedometer reads 100 km/h when you are doing 99.5 km/h.
Dimensions side by side
| 275/35R22 | 305/35R21 | |
|---|---|---|
| Overall diameter | 751 mm (29.6″) | 747 mm (29.4″) |
| Section width | 275 mm | 305 mm |
| Sidewall height | 96 mm | 107 mm |
| Rim | 22″ | 21″ |
| Revolutions per km | 424 | 426 |
| In stock | 7 tires from $489.00 | 3 tires from $552.00 |
What changes
- Overall diameter: 305/35R21 is 4.0 mm shorter (−0.5%).
- Speedometer: reads 100 km/h at an actual 99.5 km/h with 305/35R21.
- 305/35R21 is 30 mm wider, so check clearance and the recommended rim width.
- 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 275/35R22
Vehicles that use 305/35R21
See every alternate size for 275/35R22
Frequently asked questions
Can I use 305/35R21 instead of 275/35R22?
Usually, yes: 305/35R21 is within 3% of the overall diameter of 275/35R22 (−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 275/35R22 and 305/35R21?
With 305/35R21 instead of 275/35R22, the speedometer shows 100 km/h when you are actually doing 99.5 km/h.
Which vehicles came with both 275/35R22 and 305/35R21?
Both sizes were original equipment, on different trims or packages, on the 2020–2024 Bentley Flying Spur, 2024 Bentley Continental GT, 2019–2023 Bentley Continental.