215/85R16 vs 225/75R17

225/75R17 is 0.10 in (2.6 mm) shorter than 215/85R16, a −0.34% diameter difference. With the speedometer set for 215/85R16, an indicated 60 mph is 59.8 mph on 225/75R17.

Is this a safe swap?

Diameter difference −0.34%: under 1%

By overall diameter alone, 225/75R17 is a near match for 215/85R16; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

215/85R16 vs 225/75R17 differences
Measurement	215/85R16	225/75R17	Difference	% diff
Overall diameter	30.39 in (771.9 mm)	30.29 in (769.3 mm)	−0.10 in (−2.6 mm)	−0.34%
Sidewall height	7.19 in (182.8 mm)	6.64 in (168.8 mm)	−0.55 in (−14.0 mm)	−7.66%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	95.47 in (2,425.0 mm)	95.15 in (2,416.8 mm)	−0.32 in (−8.2 mm)	−0.34%
Revolutions per mile	664	666	+2	+0.34%

True speed with the speedometer calibrated for 215/85R16
Indicated	Actual on 215/85R16	Actual on 225/75R17	Difference
30 mph	30.0 mph	29.9 mph	−0.1 mph
60 mph	60.0 mph	59.8 mph	−0.2 mph
75 mph	75.0 mph	74.7 mph	−0.3 mph

Ride-height change: 225/75R17 lowers the vehicle by 0.05 in (1.3 mm) at the axle (half the −2.6 mm diameter difference).

225/75R17 is 0.10 in shorter than 215/85R16 and 10 mm wider, a 0.34% difference in overall diameter.

With the speedometer calibrated for 215/85R16, an indicated 60 mph is actually 59.8 mph on 225/75R17, and revolutions per mile change from 664 to 666.

225/75R17 mounts on a 17-inch wheel, a plus-1 fitment from the 16-inch wheel of 215/85R16.

Size pages

Other comparisons with 215/85R16

Other comparisons with 225/75R17

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.