235/65R17 vs 235/60R18Tire Size Comparison
The 0.3% diameter difference is within the accepted 3% tolerance.
Comparison Details
Speedometer Correction
When switching from 235/65R17 to 235/60R18, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 30.1 km/h | +0.1 km/h |
| 40 km/h | 40.1 km/h | +0.1 km/h |
| 50 km/h | 50.1 km/h | +0.1 km/h |
| 60 km/h | 60.2 km/h | +0.2 km/h |
| 70 km/h | 70.2 km/h | +0.2 km/h |
| 80 km/h | 80.2 km/h | +0.2 km/h |
| 90 km/h | 90.2 km/h | +0.2 km/h |
| 100 km/h | 100.3 km/h | +0.3 km/h |
| 110 km/h | 110.3 km/h | +0.3 km/h |
| 120 km/h | 120.3 km/h | +0.3 km/h |
| 130 km/h | 130.3 km/h | +0.3 km/h |
Vehicles Using These Sizes
Vehicles with 235/65R17
Vehicles with 235/60R18
Individual Tire Size Details
Practical Guidance
Switching from 235/65R17 to 235/60R18 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Note: these sizes require different rim diameters (17" vs 18"), so you will need different wheels.
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 0.26%, width changes by 0mm.
Speedometer error will be 0.26%. At an indicated 100 km/h, actual speed is about 100.3 km/h.
Ground clearance changes by +1.0mm per side.