225/50R16 vs 245/40R17
245/40R17 is 3.0 mm shorter than 225/50R16 in overall diameter (−0.5%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 245/40R17 fitted, the speedometer reads 100 km/h when you are doing 99.5 km/h.
Dimensions side by side
| 225/50R16 | 245/40R17 | |
|---|---|---|
| Overall diameter | 631 mm (24.8″) | 628 mm (24.7″) |
| Section width | 225 mm | 245 mm |
| Sidewall height | 113 mm | 98 mm |
| Rim | 16″ | 17″ |
| Revolutions per km | 504 | 507 |
| In stock | 1 tire from $292.00 | 15 tires from $115.00 |
What changes
- Overall diameter: 245/40R17 is 3.0 mm shorter (−0.5%).
- Speedometer: reads 100 km/h at an actual 99.5 km/h with 245/40R17.
- 245/40R17 is 20 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 225/50R16
Vehicles that use 245/40R17
See every alternate size for 225/50R16
Frequently asked questions
Can I use 245/40R17 instead of 225/50R16?
Usually, yes: 245/40R17 is within 3% of the overall diameter of 225/50R16 (−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 225/50R16 and 245/40R17?
With 245/40R17 instead of 225/50R16, the speedometer shows 100 km/h when you are actually doing 99.5 km/h.
Which vehicles came with both 225/50R16 and 245/40R17?
Both sizes were original equipment, on different trims or packages, on the 2001–2004 Mercedes-Benz SLK320, 2003–2004 Mercedes-Benz CLK320, 1997–2000 BMW Z3.