235/65R17 vs 245/65R17Tire Size Comparison
The 1.8% diameter difference is within the accepted 3% tolerance.
Comparison Details
Speedometer Correction
When switching from 235/65R17 to 245/65R17, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 30.5 km/h | +0.5 km/h |
| 40 km/h | 40.7 km/h | +0.7 km/h |
| 50 km/h | 50.9 km/h | +0.9 km/h |
| 60 km/h | 61.1 km/h | +1.1 km/h |
| 70 km/h | 71.2 km/h | +1.2 km/h |
| 80 km/h | 81.4 km/h | +1.4 km/h |
| 90 km/h | 91.6 km/h | +1.6 km/h |
| 100 km/h | 101.8 km/h | +1.8 km/h |
| 110 km/h | 111.9 km/h | +1.9 km/h |
| 120 km/h | 122.1 km/h | +2.1 km/h |
| 130 km/h | 132.3 km/h | +2.3 km/h |
Vehicles Using These Sizes
Vehicles with 235/65R17
Vehicles with 245/65R17
Individual Tire Size Details
Practical Guidance
Switching from 235/65R17 to 245/65R17 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Both sizes fit the same 17-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 1.76%, width changes by 10mm.
Speedometer error will be 1.76%. At an indicated 100 km/h, actual speed is about 101.8 km/h.
Ground clearance changes by +6.5mm per side.