295/35R18 vs 275/40R18
275/40R18 is a safe swap for 295/35R18 by the usual ±3% rule: the diameter differs by +2.03%.
Speedometer and odometer
With 275/40R18 on a car calibrated for 295/35R18, the speedometer reads 58.8 mph when you're really doing 60, and the odometer under-counts by 2.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.6 mph |
| 45 mph | 45.9 mph |
| 60 mph | 61.2 mph |
| 70 mph | 71.4 mph |
| 80 mph | 81.6 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 235/45R18+0.75%
- 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%
Questions
Can I replace 295/35R18 with 275/40R18?
275/40R18 is a safe swap for 295/35R18 by the usual ±3% rule: the diameter differs by +2.03%.
What's the difference between 295/35R18 and 275/40R18?
275/40R18 is 0.53" taller and 20 mm narrower; the sidewall is +0.27". At an indicated 60 mph you'd actually be doing 61.2 mph.
Will 275/40R18 fit on 295/35R18 wheels?
Both use a 18" rim, so the wheel diameter matches; check the wheel's width range for a 275 mm tire and the fender clearance.