225/75R16 vs 235/75R15Tire Size Comparison
The 1.4% diameter difference is within the accepted 3% tolerance.
Comparison Details
Speedometer Correction
When switching from 225/75R16 to 235/75R15, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 29.6 km/h | -0.4 km/h |
| 40 km/h | 39.4 km/h | -0.6 km/h |
| 50 km/h | 49.3 km/h | -0.7 km/h |
| 60 km/h | 59.2 km/h | -0.8 km/h |
| 70 km/h | 69.0 km/h | -1.0 km/h |
| 80 km/h | 78.9 km/h | -1.1 km/h |
| 90 km/h | 88.7 km/h | -1.3 km/h |
| 100 km/h | 98.6 km/h | -1.4 km/h |
| 110 km/h | 108.5 km/h | -1.5 km/h |
| 120 km/h | 118.3 km/h | -1.7 km/h |
| 130 km/h | 128.2 km/h | -1.8 km/h |
Individual Tire Size Details
Practical Guidance
Switching from 225/75R16 to 235/75R15 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Note: these sizes require different rim diameters (16" vs 15"), 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 -1.40%, width changes by 10mm.
Speedometer error will be -1.40%. At an indicated 100 km/h, actual speed is about 98.6 km/h.
Ground clearance changes by -5.2mm per side.