215/45R17 vs 245/30R19

245/30R19 is 0.17 in (4.3 mm) taller than 215/45R17, a +0.69% diameter difference. With the speedometer set for 215/45R17, an indicated 60 mph is 60.4 mph on 245/30R19.

Is this a safe swap?

Diameter difference +0.69%: under 1%

By overall diameter alone, 245/30R19 is a near match for 215/45R17; 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.

215/45R17 vs 245/30R19 differences
Measurement	215/45R17	245/30R19	Difference	% diff
Overall diameter	24.62 in (625.3 mm)	24.79 in (629.6 mm)	+0.17 in (+4.3 mm)	+0.69%
Sidewall height	3.81 in (96.8 mm)	2.89 in (73.5 mm)	−0.92 in (−23.2 mm)	−24.03%
Section width	8.46 in (215.0 mm)	9.65 in (245.0 mm)	+1.18 in (+30.0 mm)	+13.95%
Circumference	77.34 in (1,964.4 mm)	77.87 in (1,977.9 mm)	+0.53 in (+13.5 mm)	+0.69%
Revolutions per mile	819	814	−6	−0.68%

True speed with the speedometer calibrated for 215/45R17
Indicated	Actual on 215/45R17	Actual on 245/30R19	Difference
30 mph	30.0 mph	30.2 mph	+0.2 mph
60 mph	60.0 mph	60.4 mph	+0.4 mph
75 mph	75.0 mph	75.5 mph	+0.5 mph

Ride-height change: 245/30R19 raises the vehicle by 0.08 in (2.1 mm) at the axle (half the +4.3 mm diameter difference).

245/30R19 is 0.17 in taller than 215/45R17 and 30 mm wider, a 0.69% difference in overall diameter.

With the speedometer calibrated for 215/45R17, an indicated 60 mph is actually 60.4 mph on 245/30R19, and revolutions per mile change from 819 to 814.

245/30R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 215/45R17.

Size pages

Other comparisons with 215/45R17

Other comparisons with 245/30R19

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