235/35R20 vs 235/40R19
235/40R19 is 2.0 mm shorter than 235/35R20 in overall diameter (−0.3%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 235/40R19 fitted, the speedometer reads 100 km/h when you are doing 99.7 km/h.
Dimensions side by side
| 235/35R20 | 235/40R19 | |
|---|---|---|
| Overall diameter | 673 mm (26.5″) | 671 mm (26.4″) |
| Section width | 235 mm | 235 mm |
| Sidewall height | 82 mm | 94 mm |
| Rim | 20″ | 19″ |
| Revolutions per km | 473 | 474 |
| In stock | 10 tires from $256.00 | 71 tires from $144.00 |
What changes
- Overall diameter: 235/40R19 is 2.0 mm shorter (−0.3%).
- Speedometer: reads 100 km/h at an actual 99.7 km/h with 235/40R19.
- Wheel size changes from 20″ to 19″: 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 235/35R20
Vehicles that use 235/40R19
See every alternate size for 235/35R20
Frequently asked questions
Can I use 235/40R19 instead of 235/35R20?
Usually, yes: 235/40R19 is within 3% of the overall diameter of 235/35R20 (−0.3%). 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 235/35R20 and 235/40R19?
With 235/40R19 instead of 235/35R20, the speedometer shows 100 km/h when you are actually doing 99.7 km/h.
Which vehicles came with both 235/35R20 and 235/40R19?
Both sizes were original equipment, on different trims or packages, on the 2017–2024 Porsche 718, 2013–2016 Porsche Boxster, 2014–2016 Porsche Cayman.