225/60R16 vs 235/50R17
Diameter -1.42% · Speedo at 60 mph reads 59.1 mph actual · Ground clearance -4.8 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 225/60R16) reads 60 mph, the actual speed with 235/50R17 mounted is:
Speedometer error: -1.42% · Odometer reads low by 1.42%
Full comparison
| Measurement | 225/60R16 | 235/50R17 | Delta |
|---|---|---|---|
| Overall diameter | 26.63" | 26.25" | -1.42% |
| Section width | 225 mm | 235 mm | +10 mm |
| Sidewall height | 135 mm | 117.5 mm | -17.50 mm |
| Rim diameter | 16" | 17" | +1" |
| Circumference | 2125 mm | 2095 mm | -30 mm |
| Revs / mile | 757 | 768 | 11 |
| Ground clearance change | -4.8 mm | ||
Questions about this swap
What is the diameter difference between 225/60R16 and 235/50R17?
235/50R17 is 1.42% smaller in overall diameter than 225/60R16 — a difference of 9.6 mm (0.38 inches).
How does 235/50R17 affect the speedometer if the car was calibrated for 225/60R16?
When the speedometer reads 60 mph (calibrated for 225/60R16), the actual speed with 235/50R17 is 59.1 mph — an error of -1.42%.
Is it safe to replace 225/60R16 with 235/50R17?
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.