265/35R18 vs 225/45R18
225/45R18 is a safe swap for 265/35R18 by the usual ±3% rule: the diameter differs by +2.65%.
Speedometer and odometer
With 225/45R18 on a car calibrated for 265/35R18, the speedometer reads 58.5 mph when you're really doing 60, and the odometer under-counts by 2.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.2 mph |
| 60 mph | 61.6 mph |
| 70 mph | 71.9 mph |
| 80 mph | 82.1 mph |
Other sizes close to 265/35R18
- 265/35R18 vs 245/40R18+1.63%
- 265/35R18 vs 225/40R18-0.86%
- 265/35R18 vs 235/45R18+4.05%
- 265/35R18 vs 205/50R17-0.92%
- 265/35R18 vs 235/40R18+0.39%
- 265/35R18 vs 215/50R17+0.64%
- 265/35R18 vs 235/45R17+0.09%
- 265/35R18 vs 255/35R18-1.09%
- 265/35R18 vs 255/40R18+2.88%
- 265/35R18 vs 235/35R19+0.68%
- 265/35R18 vs 275/35R18+1.09%
- 265/35R18 vs 215/45R18+1.24%
Questions
Can I replace 265/35R18 with 225/45R18?
225/45R18 is a safe swap for 265/35R18 by the usual ±3% rule: the diameter differs by +2.65%.
What's the difference between 265/35R18 and 225/45R18?
225/45R18 is 0.67" taller and 40 mm narrower; the sidewall is +0.33". At an indicated 60 mph you'd actually be doing 61.6 mph.
Will 225/45R18 fit on 265/35R18 wheels?
Both use a 18" rim, so the wheel diameter matches; check the wheel's width range for a 225 mm tire and the fender clearance.