175/65R14 vs 185/65R15Tire Size Comparison
The 6.6% diameter difference exceeds 5% and could affect ABS and traction control.
Comparison Details
Speedometer Correction
When switching from 175/65R14 to 185/65R15, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 32.0 km/h | +2.0 km/h |
| 40 km/h | 42.6 km/h | +2.6 km/h |
| 50 km/h | 53.3 km/h | +3.3 km/h |
| 60 km/h | 64.0 km/h | +4.0 km/h |
| 70 km/h | 74.6 km/h | +4.6 km/h |
| 80 km/h | 85.3 km/h | +5.3 km/h |
| 90 km/h | 95.9 km/h | +5.9 km/h |
| 100 km/h | 106.6 km/h | +6.6 km/h |
| 110 km/h | 117.2 km/h | +7.2 km/h |
| 120 km/h | 127.9 km/h | +7.9 km/h |
| 130 km/h | 138.6 km/h | +8.6 km/h |
Vehicles Using These Sizes
Vehicles with 175/65R14
Individual Tire Size Details
Practical Guidance
A 6.6% diameter difference is significantly outside the safe replacement range. Switching from 175/65R14 to 185/65R15 can cause dangerous speedometer inaccuracy, ABS/traction control malfunctions, and potential clearance issues. This change is not recommended without professional verification and possible ECU recalibration.
The 3% diameter tolerance is a widely accepted industry guideline referenced by the ETRTO and most vehicle manufacturers. When in doubt, consult your vehicle's owner's manual or a qualified tire professional. For U.S. tire safety standards and recalls, see the NHTSA Tire Safety page.
Frequently Asked Questions
Not Recommended. The overall diameter differs by 6.59%, width changes by 10mm.
Speedometer error will be 6.59%. At an indicated 100 km/h, actual speed is about 106.6 km/h.
Ground clearance changes by +19.2mm per side.