205/55R16 vs 255/40R17
255/40R17 is 4.0 mm taller than 205/55R16 in overall diameter (+0.6%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 255/40R17 fitted, the speedometer reads 100 km/h when you are doing 100.6 km/h.
Dimensions side by side
| 205/55R16 | 255/40R17 | |
|---|---|---|
| Overall diameter | 632 mm (24.9″) | 636 mm (25.0″) |
| Section width | 205 mm | 255 mm |
| Sidewall height | 113 mm | 102 mm |
| Rim | 16″ | 17″ |
| Revolutions per km | 504 | 500 |
| In stock | 92 tires from $88.00 | 5 tires from $225.00 |
What changes
- Overall diameter: 255/40R17 is 4.0 mm taller (+0.6%).
- Speedometer: reads 100 km/h at an actual 100.6 km/h with 255/40R17.
- 255/40R17 is 50 mm wider, so check clearance and the recommended rim width.
- Wheel size changes from 16″ to 17″: 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 205/55R16
Vehicles that use 255/40R17
See every alternate size for 205/55R16
Frequently asked questions
Can I use 255/40R17 instead of 205/55R16?
Usually, yes: 255/40R17 is within 3% of the overall diameter of 205/55R16 (+0.6%). 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 205/55R16 and 255/40R17?
With 255/40R17 instead of 205/55R16, the speedometer shows 100 km/h when you are actually doing 100.6 km/h.
Which vehicles came with both 205/55R16 and 255/40R17?
Both sizes were original equipment, on different trims or packages, on the 2011–2012 BMW 328i, 1997–2004 Porsche Boxster, 2000–2001 Audi A6, 1992–1995 Porsche 968, 1994–1995 Porsche 911.