215/70R15 vs 225/60R16
Diameter -0.82% · Speedo at 60 mph reads 59.5 mph actual · Ground clearance -2.8 mm
Generally safe — within the 3% tolerance
The diameter difference is ≤3%, which is the widely-accepted fitment tolerance for speedometer accuracy and ABS/traction-control calibration. Verify clearance and load rating with a tire professional before installing.
Speedometer effect
When the vehicle's speedometer (calibrated to 215/70R15) reads 60 mph, the actual speed with 225/60R16 mounted is:
Speedometer error: -0.82% · Odometer reads low by 0.82%
Full comparison
| Measurement | 215/70R15 | 225/60R16 | Delta |
|---|---|---|---|
| Overall diameter | 26.85" | 26.63" | -0.82% |
| Section width | 215 mm | 225 mm | +10 mm |
| Sidewall height | 150.5 mm | 135 mm | -15.50 mm |
| Rim diameter | 15" | 16" | +1" |
| Circumference | 2143 mm | 2125 mm | -18 mm |
| Revs / mile | 751 | 757 | 6 |
| Ground clearance change | -2.8 mm | ||
Questions about this swap
What is the diameter difference between 215/70R15 and 225/60R16?
225/60R16 is 0.82% smaller in overall diameter than 215/70R15 — a difference of 5.6 mm (0.22 inches).
How does 225/60R16 affect the speedometer if the car was calibrated for 215/70R15?
When the speedometer reads 60 mph (calibrated for 215/70R15), the actual speed with 225/60R16 is 59.5 mph — an error of -0.82%.
Is it safe to replace 215/70R15 with 225/60R16?
Generally safe — within the 3% tolerance. The diameter difference is ≤3%, which is the widely-accepted fitment tolerance for speedometer accuracy and ABS/traction-control calibration. Verify clearance and load rating with a tire professional before installing.
All calculations use standard ETRTO formulas. Confirm fitment with a qualified tire professional and your vehicle's door-placard before purchasing.