185/65R15 vs 215/60R15
215/60R15 is a safe swap for 185/65R15 by the usual ±3% rule: the diameter differs by +2.82%.
Speedometer and odometer
With 215/60R15 on a car calibrated for 185/65R15, the speedometer reads 58.4 mph when you're really doing 60, and the odometer under-counts by 2.8%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 30.8 mph |
| 45 mph | 46.3 mph |
| 60 mph | 61.7 mph |
| 70 mph | 72.0 mph |
| 80 mph | 82.3 mph |
Other sizes close to 185/65R15
Questions
Can I replace 185/65R15 with 215/60R15?
215/60R15 is a safe swap for 185/65R15 by the usual ±3% rule: the diameter differs by +2.82%.
What's the difference between 185/65R15 and 215/60R15?
215/60R15 is 0.69" taller and 30 mm wider; the sidewall is +0.34". At an indicated 60 mph you'd actually be doing 61.7 mph.
Will 215/60R15 fit on 185/65R15 wheels?
Both use a 15" rim, so the wheel diameter matches; check the wheel's width range for a 215 mm tire and the fender clearance.