175/65R14 vs 185/60R15 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 | 175/65R14 | 185/60R15 | Difference |
|---|---|---|---|
| Overall Diameter | 583.1 mm (23") | 603 mm (23.7") | +19.9 mm |
| Section Width | 175 mm (6.9") | 185 mm (7.3") | +10 mm |
| Sidewall Height | 113.8 mm | 111 mm | -2.8 mm |
| Circumference | 1831.9 mm | 1894.4 mm | +62.5 mm |
| Revolutions/Mile | 879 | 850 | -29 |
| Aspect Ratio | 65% | 60% | -5% |
| Rim Diameter | 14" | 15" | +1" |
Key Impact Summary
Speedometer Correction Table
When switching from 175/65R14 to 185/60R15, 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 | 41.4 mph | +1.4 mph |
| 50 mph | 51.7 mph | +1.7 mph |
| 60 mph | 62 mph | +2 mph |
| 70 mph | 72.4 mph | +2.4 mph |
| 80 mph | 82.7 mph | +2.7 mph |
| 90 mph | 93.1 mph | +3.1 mph |
| 100 mph | 103.4 mph | +3.4 mph |
| 110 mph | 113.8 mph | +3.8 mph |
| 120 mph | 124.1 mph | +4.1 mph |
What This Swap Means
Wider tires (185/60R15): 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 2.8mm 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.