295/70R18 vs 305/70R18
305/70R18 is a safe swap for 295/70R18 by the usual ±3% rule: the diameter differs by +1.61%.
Speedometer and odometer
With 305/70R18 on a car calibrated for 295/70R18, the speedometer reads 59.0 mph when you're really doing 60, and the odometer under-counts by 1.6%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.5 mph |
| 45 mph | 45.7 mph |
| 60 mph | 61.0 mph |
| 70 mph | 71.1 mph |
| 80 mph | 81.3 mph |
Other sizes close to 295/70R18
- 295/70R18 vs 275/70R18-3.22%
- 295/70R18 vs 265/70R18-4.83%
- 295/70R18 vs 35x12.50R18+2.16%
- 295/70R18 vs 315/70R17+0.30%
- 295/70R18 vs 285/65R18-4.88%
- 295/70R18 vs 33x12.50R18-3.68%
- 295/70R18 vs 285/75R18+1.67%
- 295/70R18 vs 325/65R18+1.09%
- 295/70R18 vs 305/65R18-1.90%
- 295/70R18 vs 285/70R18-1.61%
- 295/70R18 vs 325/60R18-2.64%
Questions
Can I replace 295/70R18 with 305/70R18?
305/70R18 is a safe swap for 295/70R18 by the usual ±3% rule: the diameter differs by +1.61%.
What's the difference between 295/70R18 and 305/70R18?
305/70R18 is 0.55" taller and 10 mm wider; the sidewall is +0.28". At an indicated 60 mph you'd actually be doing 61.0 mph.
Will 305/70R18 fit on 295/70R18 wheels?
Both use a 18" rim, so the wheel diameter matches; check the wheel's width range for a 305 mm tire and the fender clearance.