195/55R15 vs 185/65R15
185/65R15 is outside the ±3% rule as a replacement for 195/55R15: the diameter differs by +4.37%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
Speedometer and odometer
With 185/65R15 on a car calibrated for 195/55R15, the speedometer reads 57.5 mph when you're really doing 60, and the odometer under-counts by 4.4%.
| Speedo shows | Actual speed |
|---|---|
| 30 mph | 31.3 mph |
| 45 mph | 47.0 mph |
| 60 mph | 62.6 mph |
| 70 mph | 73.1 mph |
| 80 mph | 83.5 mph |
Other sizes close to 195/55R15
- 195/55R15 vs 185/60R15+1.26%
- 195/55R15 vs 195/60R15+3.27%
- 195/55R15 vs 175/65R15+2.18%
- 195/55R15 vs 185/65R14+0.10%
- 195/55R15 vs 205/50R15-1.60%
- 195/55R15 vs 195/50R16+0.99%
- 195/55R15 vs 185/55R15-1.85%
- 195/55R15 vs 205/45R16-0.77%
- 195/55R15 vs 175/70R14+0.86%
- 195/55R15 vs 225/45R15-2.02%
- 195/55R15 vs 195/50R15-3.27%
- 195/55R15 vs 225/50R15+1.76%
Questions
Can I replace 195/55R15 with 185/65R15?
185/65R15 is outside the ±3% rule as a replacement for 195/55R15: the diameter differs by +4.37%, so the speedometer, odometer and ABS calibration will be off and clearance needs checking.
What's the difference between 195/55R15 and 185/65R15?
185/65R15 is 1.02" taller and 10 mm narrower; the sidewall is +0.51". At an indicated 60 mph you'd actually be doing 62.6 mph.
Will 185/65R15 fit on 195/55R15 wheels?
Both use a 15" rim, so the wheel diameter matches; check the wheel's width range for a 185 mm tire and the fender clearance.