235/50R18 vs 235/55R17
235/55R17 is 2.0 mm shorter than 235/50R18 in overall diameter (−0.3%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 235/55R17 fitted, the speedometer reads 100 km/h when you are doing 99.7 km/h.
Dimensions side by side
| 235/50R18 | 235/55R17 | |
|---|---|---|
| Overall diameter | 692 mm (27.2″) | 690 mm (27.2″) |
| Section width | 235 mm | 235 mm |
| Sidewall height | 118 mm | 129 mm |
| Rim | 18″ | 17″ |
| Revolutions per km | 460 | 461 |
| In stock | 53 tires from $117.00 | 48 tires from $119.00 |
What changes
- Overall diameter: 235/55R17 is 2.0 mm shorter (−0.3%).
- Speedometer: reads 100 km/h at an actual 99.7 km/h with 235/55R17.
- Wheel size changes from 18″ 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 235/50R18
Vehicles that use 235/55R17
See every alternate size for 235/50R18
Frequently asked questions
Can I use 235/55R17 instead of 235/50R18?
Usually, yes: 235/55R17 is within 3% of the overall diameter of 235/50R18 (−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 235/50R18 and 235/55R17?
With 235/55R17 instead of 235/50R18, the speedometer shows 100 km/h when you are actually doing 99.7 km/h.
Which vehicles came with both 235/50R18 and 235/55R17?
Both sizes were original equipment, on different trims or packages, on the 2006–2009, 2015–2023 Ford Mustang, 2013–2019 Ford Escape, 2009–2011, 2014–2016 Volkswagen Tiguan, 2009, 2014–2016 Volvo XC70, 2004–2010 BMW X3, 2008–2009 Cadillac CTS.