185/60R15 vs 205/60R15
205/60R15 is outside the ±3% rule as a replacement for 185/60R15: the diameter differs by +3.98%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 205/60R15 on a car calibrated for 185/60R15, the speedometer reads 57.7 mph when you're really doing 60, and the odometer under-counts by 4.0%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.2 mph |
| 45 mph | 46.8 mph |
| 60 mph | 62.4 mph |
| 70 mph | 72.8 mph |
| 80 mph | 83.2 mph |
Other sizes close to 185/60R15
- 185/60R15 vs 185/65R15+3.07%
- 185/60R15 vs 195/60R15+1.99%
- 185/60R15 vs 175/65R15+0.91%
- 185/60R15 vs 205/50R15-2.82%
- 185/60R15 vs 195/50R16-0.27%
- 185/60R15 vs 195/55R15-1.24%
- 185/60R15 vs 185/55R15-3.07%
- 185/60R15 vs 175/70R14-0.40%
- 185/60R15 vs 225/45R15-3.23%
- 185/60R15 vs 195/50R15-4.48%
- 185/60R15 vs 225/50R15+0.50%
- 185/60R15 vs 245/40R15-4.31%
Questions
Can I replace 185/60R15 with 205/60R15?
205/60R15 is outside the ±3% rule as a replacement for 185/60R15: the diameter differs by +3.98%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 185/60R15 and 205/60R15?
205/60R15 is 0.94" taller and 20 mm wider; the sidewall is +0.47". At an indicated 60 mph you'd actually be doing 62.4 mph.
Will 205/60R15 fit on 185/60R15 wheels?
Both use a 15" rim, so the wheel diameter matches; check the wheel's width range for a 205 mm tire and the fender clearance.