195/50R16 vs 215/40R17
Comparison of overall diameter, sidewall, speedometer error, and ride-height change between these two tire sizes.
195/50R16
- Section width
- 195 mm
- Aspect ratio
- 50%
- Rim
- 16"
- Sidewall
- 97.5 mm
- Overall diameter
- 601.4 mm
- Revs / mile
- 852
215/40R17
- Section width
- 215 mm
- Aspect ratio
- 40%
- Rim
- 17"
- Sidewall
- 86.0 mm
- Overall diameter
- 603.8 mm
- Revs / mile
- 848
Difference
- Overall diameter
- +2.4 mm (+0.40%)
- Sidewall
- -11.5 mm
- Tread width
- +20 mm
- Ride height (axle)
- +1.2 mm
- Speedometer error
- +0.40%
- At indicated 60 mph
- actual 60.24 mph
Will 215/40R17 fit instead of 195/50R16?
The overall diameter changes by 0.40%. Most manufacturers consider a swap acceptable when the difference stays under 3% — beyond that, you may see speedometer error, ABS/TPMS warnings, or wheel-well clearance problems. This page only covers the math; your vehicle's wheel arches, suspension geometry, and load rating still matter.
What the numbers mean
- Overall diameter is the outside-to-outside height of the tire. Affects ride height, gearing, and speedometer.
- Sidewall is the height of the rubber from rim to tread. Lower sidewall = sharper steering, harsher ride.
- Speedometer error is the percentage your indicated speed will be off after the swap (positive = speedo reads lower than actual).