295/35R18 vs 235/45R18
235/45R18 is a safe swap for 295/35R18 by the usual ±3% rule: the diameter differs by +0.75%.
Speedometer and odometer
With 235/45R18 on a car calibrated for 295/35R18, the speedometer reads 59.6 mph when you're really doing 60, and the odometer under-counts by 0.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.2 mph |
| 45 mph | 45.3 mph |
| 60 mph | 60.5 mph |
| 70 mph | 70.5 mph |
| 80 mph | 80.6 mph |
Other sizes close to 295/35R18
- 295/35R18 vs 225/45R18-0.60%
- 295/35R18 vs 245/40R18-1.58%
- 295/35R18 vs 225/40R18-3.99%
- 295/35R18 vs 245/45R18+2.11%
- 295/35R18 vs 235/50R18+4.29%
- 295/35R18 vs 215/55R17+0.69%
- 295/35R18 vs 235/40R18-2.79%
- 295/35R18 vs 225/50R18+2.79%
- 295/35R18 vs 255/35R19-0.39%
- 295/35R18 vs 255/35R18-4.22%
- 295/35R18 vs 255/40R18-0.38%
- 295/35R18 vs 225/40R19-0.17%
Questions
Can I replace 295/35R18 with 235/45R18?
235/45R18 is a safe swap for 295/35R18 by the usual ±3% rule: the diameter differs by +0.75%.
What's the difference between 295/35R18 and 235/45R18?
235/45R18 is 0.20" taller and 60 mm narrower; the sidewall is +0.10". At an indicated 60 mph you'd actually be doing 60.5 mph.
Will 235/45R18 fit on 295/35R18 wheels?
Both use a 18" rim, so the wheel diameter matches; check the wheel's width range for a 235 mm tire and the fender clearance.