195/65R15 vs 185/65R15Tire Size Comparison
The 2.0% diameter difference is within the accepted 3% tolerance.
Comparison Details
Speedometer Correction
When switching from 195/65R15 to 185/65R15, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 29.4 km/h | -0.6 km/h |
| 40 km/h | 39.2 km/h | -0.8 km/h |
| 50 km/h | 49.0 km/h | -1.0 km/h |
| 60 km/h | 58.8 km/h | -1.2 km/h |
| 70 km/h | 68.6 km/h | -1.4 km/h |
| 80 km/h | 78.4 km/h | -1.6 km/h |
| 90 km/h | 88.2 km/h | -1.8 km/h |
| 100 km/h | 98.0 km/h | -2.0 km/h |
| 110 km/h | 107.7 km/h | -2.3 km/h |
| 120 km/h | 117.5 km/h | -2.5 km/h |
| 130 km/h | 127.3 km/h | -2.7 km/h |
Individual Tire Size Details
Practical Guidance
Switching from 195/65R15 to 185/65R15 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Both sizes fit the same 15-inch rim, so no wheel change is needed.
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
Safe. The overall diameter differs by -2.05%, width changes by -10mm.
Speedometer error will be -2.05%. At an indicated 100 km/h, actual speed is about 98.0 km/h.
Ground clearance changes by -6.5mm per side.