245/70R17 vs 265/60R18
265/60R18 is a safe swap for 245/70R17 by the usual ±3% rule: the diameter differs by +0.05%.
Speedometer and odometer
With 265/60R18 on a car calibrated for 245/70R17, the speedometer reads 60.0 mph when you're really doing 60, and the odometer under-counts by 0.1%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.0 mph |
| 45 mph | 45.0 mph |
| 60 mph | 60.0 mph |
| 70 mph | 70.0 mph |
| 80 mph | 80.0 mph |
Other sizes close to 245/70R17
- 245/70R17 vs 265/70R17+3.61%
- 245/70R17 vs 235/65R17-4.84%
- 245/70R17 vs 245/65R17-3.16%
- 245/70R17 vs 245/75R16-0.12%
- 245/70R17 vs 245/75R17+3.16%
- 245/70R17 vs 265/65R17+0.19%
- 245/70R17 vs 265/70R16+0.34%
- 245/70R17 vs 235/80R17+4.26%
- 245/70R17 vs 255/65R17-1.48%
- 245/70R17 vs 215/85R16-0.37%
- 245/70R17 vs 255/70R17+1.81%
- 245/70R17 vs 235/75R17+1.23%
Questions
Can I replace 245/70R17 with 265/60R18?
265/60R18 is a safe swap for 245/70R17 by the usual ±3% rule: the diameter differs by +0.05%.
What's the difference between 245/70R17 and 265/60R18?
265/60R18 is 0.02" taller and 20 mm wider; the sidewall is -0.49". At an indicated 60 mph you'd actually be doing 60.0 mph.
Will 265/60R18 fit on 245/70R17 wheels?
No — 245/70R17 needs a 17" wheel and 265/60R18 a 18" wheel. This is a plus/minus-size swap that changes wheels too.