225/40R18 vs 265/35R18
265/35R18 is 6.0 mm taller than 225/40R18 in overall diameter (+0.9%), within the usual 3% limit, so it can replace it where the wheels and clearance allow. With 265/35R18 fitted, the speedometer reads 100 km/h when you are doing 100.9 km/h.
Dimensions side by side
| 225/40R18 | 265/35R18 | |
|---|---|---|
| Overall diameter | 637 mm (25.1″) | 643 mm (25.3″) |
| Section width | 225 mm | 265 mm |
| Sidewall height | 90 mm | 93 mm |
| Rim | 18″ | 18″ |
| Revolutions per km | 500 | 495 |
| In stock | 77 tires from $110.00 | 15 tires from $123.00 |
What changes
- Overall diameter: 265/35R18 is 6.0 mm taller (+0.9%).
- Speedometer: reads 100 km/h at an actual 100.9 km/h with 265/35R18.
- 265/35R18 is 40 mm wider, so check clearance and the recommended rim width.
- Choose a load index at least as high as the one on your door placard.
Vehicles that came with both sizes
Vehicles that use 225/40R18
Vehicles that use 265/35R18
See every alternate size for 225/40R18
Frequently asked questions
Can I use 265/35R18 instead of 225/40R18?
Usually, yes: 265/35R18 is within 3% of the overall diameter of 225/40R18 (+0.9%). 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 225/40R18 and 265/35R18?
With 265/35R18 instead of 225/40R18, the speedometer shows 100 km/h when you are actually doing 100.9 km/h.
Which vehicles came with both 225/40R18 and 265/35R18?
Both sizes were original equipment, on different trims or packages, on the 2005–2007 Maserati Coupe, 2006–2007 Maserati GranSport, 2004–2005 Maserati Spyder, 2000–2004 Porsche Boxster, 1995–2001 Porsche 911.