TireSizesFinder

215/75R16 vs 225/60R18

225/60R18 is 0.07 in (1.7 mm) shorter than 215/75R16, a −0.23% diameter difference. With the speedometer set for 215/75R16, an indicated 60 mph is 59.9 mph on 225/60R18.

Is this a safe swap?

Diameter difference −0.23%: under 1%

By overall diameter alone, 225/60R18 is a near match for 215/75R16; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 215/75R16 (28.70 in) vs 225/60R18 (28.63 in)215/75R1628.70 in × 8.46 in225/60R1828.63 in × 8.86 in
Side profile and tread width, drawn to the same scale.
215/75R16 vs 225/60R18 differences
Measurement215/75R16225/60R18Difference% diff
Overall diameter28.70 in (728.9 mm)28.63 in (727.2 mm)−0.07 in (−1.7 mm)−0.23%
Sidewall height6.35 in (161.3 mm)5.31 in (135.0 mm)−1.03 in (−26.2 mm)−16.28%
Section width8.46 in (215.0 mm)8.86 in (225.0 mm)+0.39 in (+10.0 mm)+4.65%
Circumference90.15 in (2,289.9 mm)89.94 in (2,284.6 mm)−0.21 in (−5.3 mm)−0.23%
Revolutions per mile703704+2+0.23%
True speed with the speedometer calibrated for 215/75R16
IndicatedActual on 215/75R16Actual on 225/60R18Difference
30 mph30.0 mph29.9 mph−0.1 mph
60 mph60.0 mph59.9 mph−0.1 mph
75 mph75.0 mph74.8 mph−0.2 mph

Ride-height change: 225/60R18 lowers the vehicle by 0.03 in (0.8 mm) at the axle (half the −1.7 mm diameter difference).

225/60R18 is 0.07 in shorter than 215/75R16 and 10 mm wider, a 0.23% difference in overall diameter.

With the speedometer calibrated for 215/75R16, an indicated 60 mph is actually 59.9 mph on 225/60R18, and revolutions per mile change from 703 to 704.

225/60R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 215/75R16.

Size pages

Other comparisons with 215/75R16

Other comparisons with 225/60R18

Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.