185/70R14 vs 195/65R15 Side-by-side tire size comparison with specs and compatibility
This tire swap is between 3-5% diameter difference. Check for fender clearance and be aware of speedometer error. May require recalibration.
Full Specifications Comparison
| Specification | 185/70R14 | 195/65R15 | Difference |
|---|---|---|---|
| Overall Diameter | 614.6 mm (24.2") | 634.5 mm (25") | +19.9 mm |
| Section Width | 185 mm (7.3") | 195 mm (7.7") | +10 mm |
| Sidewall Height | 129.5 mm | 126.8 mm | -2.7 mm |
| Circumference | 1930.8 mm | 1993.3 mm | +62.5 mm |
| Revolutions/Mile | 834 | 807 | -27 |
| Aspect Ratio | 70% | 65% | -5% |
| Rim Diameter | 14" | 15" | +1" |
Key Impact Summary
Speedometer Correction Table
When switching from 185/70R14 to 195/65R15, your speedometer will under-read. Here is the correction at common speeds:
| Speedometer Shows | Actual Speed (mph) | Difference |
|---|---|---|
| 30 mph | 31 mph | +1 mph |
| 40 mph | 41.3 mph | +1.3 mph |
| 50 mph | 51.6 mph | +1.6 mph |
| 60 mph | 61.9 mph | +1.9 mph |
| 70 mph | 72.3 mph | +2.3 mph |
| 80 mph | 82.6 mph | +2.6 mph |
| 90 mph | 92.9 mph | +2.9 mph |
| 100 mph | 103.2 mph | +3.2 mph |
| 110 mph | 113.6 mph | +3.6 mph |
| 120 mph | 123.9 mph | +3.9 mph |
What This Swap Means
Wider tires (195/65R15): The 10mm wider contact patch provides better grip in dry conditions and improved cornering stability. However, wider tires increase rolling resistance slightly, which may affect fuel economy by 1-2%. They are also more susceptible to hydroplaning in wet conditions.
Shorter sidewall: The 2.7mm decrease in sidewall height improves steering response and cornering precision. However, ride quality becomes firmer and the wheels are more vulnerable to pothole damage. This is a common trade-off when upsizing wheels (plus-sizing).
Ground clearance: Increases by 9.9mm, providing slightly better approach angles for off-road driving and speed bump clearance.