275/40R20 vs 285/35R21Tire Size Comparison
The 0.7% diameter difference is within the accepted 3% tolerance.
Comparison Details
Speedometer Correction
When switching from 275/40R20 to 285/35R21, your speedometer will differ from actual speed.
| Speedometer | Actual Speed | Difference |
|---|---|---|
| 30 km/h | 30.2 km/h | +0.2 km/h |
| 40 km/h | 40.3 km/h | +0.3 km/h |
| 50 km/h | 50.3 km/h | +0.3 km/h |
| 60 km/h | 60.4 km/h | +0.4 km/h |
| 70 km/h | 70.5 km/h | +0.5 km/h |
| 80 km/h | 80.5 km/h | +0.5 km/h |
| 90 km/h | 90.6 km/h | +0.6 km/h |
| 100 km/h | 100.7 km/h | +0.7 km/h |
| 110 km/h | 110.7 km/h | +0.7 km/h |
| 120 km/h | 120.8 km/h | +0.8 km/h |
| 130 km/h | 130.9 km/h | +0.9 km/h |
Vehicles Using These Sizes
Vehicles with 275/40R20
Individual Tire Size Details
Practical Guidance
Switching from 275/40R20 to 285/35R21 is within the industry-accepted 3% diameter tolerance. Your speedometer, ABS, and traction control should function normally. Note: these sizes require different rim diameters (20" vs 21"), 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 0.67%, width changes by 10mm.
Speedometer error will be 0.67%. At an indicated 100 km/h, actual speed is about 100.7 km/h.
Ground clearance changes by +2.4mm per side.