205/55R17 vs 225/40R19

225/40R19 is 0.21 in (5.3 mm) taller than 205/55R17, a +0.81% diameter difference. With the speedometer set for 205/55R17, an indicated 60 mph is 60.5 mph on 225/40R19.

Is this a safe swap?

Diameter difference +0.81%: under 1%

By overall diameter alone, 225/40R19 is a near match for 205/55R17; 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.

205/55R17 vs 225/40R19 differences
Measurement	205/55R17	225/40R19	Difference	% diff
Overall diameter	25.88 in (657.3 mm)	26.09 in (662.6 mm)	+0.21 in (+5.3 mm)	+0.81%
Sidewall height	4.44 in (112.8 mm)	3.54 in (90.0 mm)	−0.90 in (−22.7 mm)	−20.18%
Section width	8.07 in (205.0 mm)	8.86 in (225.0 mm)	+0.79 in (+20.0 mm)	+9.76%
Circumference	81.30 in (2,065.0 mm)	81.95 in (2,081.6 mm)	+0.66 in (+16.7 mm)	+0.81%
Revolutions per mile	779	773	−6	−0.80%

True speed with the speedometer calibrated for 205/55R17
Indicated	Actual on 205/55R17	Actual on 225/40R19	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.5 mph	+0.5 mph
75 mph	75.0 mph	75.6 mph	+0.6 mph

Ride-height change: 225/40R19 raises the vehicle by 0.10 in (2.6 mm) at the axle (half the +5.3 mm diameter difference).

225/40R19 is 0.21 in taller than 205/55R17 and 20 mm wider, a 0.81% difference in overall diameter.

With the speedometer calibrated for 205/55R17, an indicated 60 mph is actually 60.5 mph on 225/40R19, and revolutions per mile change from 779 to 773.

225/40R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 205/55R17.

Size pages

Other comparisons with 205/55R17

Other comparisons with 225/40R19

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