195/70R15 vs 225/55R16

225/55R16 is 0.00 in (0.1 mm) shorter than 195/70R15, a −0.02% diameter difference. With the speedometer set for 195/70R15, an indicated 60 mph is 60.0 mph on 225/55R16.

Is this a safe swap?

Diameter difference −0.02%: under 1%

By overall diameter alone, 225/55R16 is a near match for 195/70R15; 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.

195/70R15 vs 225/55R16 differences
Measurement	195/70R15	225/55R16	Difference	% diff
Overall diameter	25.75 in (654.0 mm)	25.74 in (653.9 mm)	0.00 in (−0.1 mm)	−0.02%
Sidewall height	5.37 in (136.5 mm)	4.87 in (123.8 mm)	−0.50 in (−12.7 mm)	−9.34%
Section width	7.68 in (195.0 mm)	8.86 in (225.0 mm)	+1.18 in (+30.0 mm)	+15.38%
Circumference	80.89 in (2,054.6 mm)	80.88 in (2,054.3 mm)	−0.01 in (−0.3 mm)	−0.02%
Revolutions per mile	783	783	0	+0.02%

True speed with the speedometer calibrated for 195/70R15
Indicated	Actual on 195/70R15	Actual on 225/55R16
30 mph	30.0 mph	30.0 mph
60 mph	60.0 mph	60.0 mph
75 mph	75.0 mph	75.0 mph

Ride-height change: 225/55R16 lowers the vehicle by 0.00 in (0.1 mm) at the axle (half the −0.1 mm diameter difference).

225/55R16 is the same height as 195/70R15 and 30 mm wider, a 0.02% difference in overall diameter.

With the speedometer calibrated for 195/70R15, an indicated 60 mph is actually 60.0 mph on 225/55R16, and revolutions per mile change from 783 to 783.

225/55R16 mounts on a 16-inch wheel, a plus-1 fitment from the 15-inch wheel of 195/70R15.

Size pages

Other comparisons with 195/70R15

Other comparisons with 225/55R16

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