215/55R17 vs 225/40R19

225/40R19 is 0.22 in (5.7 mm) shorter than 215/55R17, a −0.85% diameter difference. With the speedometer set for 215/55R17, an indicated 60 mph is 59.5 mph on 225/40R19.

Is this a safe swap?

Diameter difference −0.85%: under 1%

By overall diameter alone, 225/40R19 is a near match for 215/55R17; 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.

215/55R17 vs 225/40R19 differences
Measurement	215/55R17	225/40R19	Difference	% diff
Overall diameter	26.31 in (668.3 mm)	26.09 in (662.6 mm)	−0.22 in (−5.7 mm)	−0.85%
Sidewall height	4.66 in (118.3 mm)	3.54 in (90.0 mm)	−1.11 in (−28.2 mm)	−23.89%
Section width	8.46 in (215.0 mm)	8.86 in (225.0 mm)	+0.39 in (+10.0 mm)	+4.65%
Circumference	82.66 in (2,099.5 mm)	81.95 in (2,081.6 mm)	−0.71 in (−17.9 mm)	−0.85%
Revolutions per mile	767	773	+7	+0.86%

True speed with the speedometer calibrated for 215/55R17
Indicated	Actual on 215/55R17	Actual on 225/40R19	Difference
30 mph	30.0 mph	29.7 mph	−0.3 mph
60 mph	60.0 mph	59.5 mph	−0.5 mph
75 mph	75.0 mph	74.4 mph	−0.6 mph

Ride-height change: 225/40R19 lowers the vehicle by 0.11 in (2.9 mm) at the axle (half the −5.7 mm diameter difference).

225/40R19 is 0.22 in shorter than 215/55R17 and 10 mm wider, a 0.85% difference in overall diameter.

With the speedometer calibrated for 215/55R17, an indicated 60 mph is actually 59.5 mph on 225/40R19, and revolutions per mile change from 767 to 773.

225/40R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 215/55R17.

Size pages

Other comparisons with 215/55R17

Other comparisons with 225/40R19

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