225/45R18 vs 295/30R19

295/30R19 is 0.00 in (0.1 mm) shorter than 225/45R18, a −0.02% diameter difference. With the speedometer set for 225/45R18, an indicated 60 mph is 60.0 mph on 295/30R19.

Is this a safe swap?

Diameter difference −0.02%: under 1%

By overall diameter alone, 295/30R19 is a near match for 225/45R18; 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.

225/45R18 vs 295/30R19 differences
Measurement	225/45R18	295/30R19	Difference	% diff
Overall diameter	25.97 in (659.7 mm)	25.97 in (659.6 mm)	0.00 in (−0.1 mm)	−0.02%
Sidewall height	3.99 in (101.3 mm)	3.48 in (88.5 mm)	−0.50 in (−12.7 mm)	−12.59%
Section width	8.86 in (225.0 mm)	11.61 in (295.0 mm)	+2.76 in (+70.0 mm)	+31.11%
Circumference	81.59 in (2,072.5 mm)	81.58 in (2,072.2 mm)	−0.01 in (−0.3 mm)	−0.02%
Revolutions per mile	777	777	0	+0.02%

True speed with the speedometer calibrated for 225/45R18
Indicated	Actual on 225/45R18	Actual on 295/30R19
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: 295/30R19 lowers the vehicle by 0.00 in (0.1 mm) at the axle (half the −0.1 mm diameter difference).

295/30R19 is the same height as 225/45R18 and 70 mm wider, a 0.02% difference in overall diameter.

With the speedometer calibrated for 225/45R18, an indicated 60 mph is actually 60.0 mph on 295/30R19, and revolutions per mile change from 777 to 777.

295/30R19 mounts on a 19-inch wheel, a plus-1 fitment from the 18-inch wheel of 225/45R18.

Size pages

Other comparisons with 225/45R18

Other comparisons with 295/30R19

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