265/65R18 vs 275/70R18
275/70R18 is outside the ±3% rule as a replacement for 265/65R18: the diameter differs by +5.05%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 275/70R18 on a car calibrated for 265/65R18, the speedometer reads 57.1 mph when you're really doing 60, and the odometer under-counts by 5.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.5 mph |
| 45 mph | 47.3 mph |
| 60 mph | 63.0 mph |
| 70 mph | 73.5 mph |
| 80 mph | 84.0 mph |
Other sizes close to 265/65R18
- 265/65R18 vs 265/70R17+0.14%
- 265/65R18 vs 275/65R18+1.62%
- 265/65R18 vs 265/60R18-3.31%
- 265/65R18 vs 265/70R18+3.31%
- 265/65R18 vs 235/65R18-4.86%
- 265/65R18 vs 245/75R17-0.30%
- 265/65R18 vs 235/80R17+0.76%
- 265/65R18 vs 255/70R18+1.56%
- 265/65R18 vs 255/65R18-1.62%
- 265/65R18 vs 285/65R18+3.24%
- 265/65R18 vs 255/60R18-4.80%
- 265/65R18 vs 33x12.50R18+4.55%
Questions
Can I replace 265/65R18 with 275/70R18?
275/70R18 is outside the ±3% rule as a replacement for 265/65R18: the diameter differs by +5.05%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 265/65R18 and 275/70R18?
275/70R18 is 1.59" taller and 10 mm wider; the sidewall is +0.80". At an indicated 60 mph you'd actually be doing 63.0 mph.
Will 275/70R18 fit on 265/65R18 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.