TireSizesFinder

195/55R16 vs 225/35R18

225/35R18 is 0.24 in (6.2 mm) shorter than 195/55R16, a −1.00% diameter difference. With the speedometer set for 195/55R16, an indicated 60 mph is 59.4 mph on 225/35R18.

Is this a safe swap?

Diameter difference −1.00%: under 1%

By overall diameter alone, 225/35R18 is a near match for 195/55R16; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 195/55R16 (24.44 in) vs 225/35R18 (24.20 in)195/55R1624.44 in × 7.68 in225/35R1824.20 in × 8.86 in
Side profile and tread width, drawn to the same scale.
195/55R16 vs 225/35R18 differences
Measurement195/55R16225/35R18Difference% diff
Overall diameter24.44 in (620.9 mm)24.20 in (614.7 mm)−0.24 in (−6.2 mm)−1.00%
Sidewall height4.22 in (107.3 mm)3.10 in (78.8 mm)−1.12 in (−28.5 mm)−26.57%
Section width7.68 in (195.0 mm)8.86 in (225.0 mm)+1.18 in (+30.0 mm)+15.38%
Circumference76.80 in (1,950.6 mm)76.03 in (1,931.1 mm)−0.77 in (−19.5 mm)−1.00%
Revolutions per mile825833+8+1.01%
True speed with the speedometer calibrated for 195/55R16
IndicatedActual on 195/55R16Actual on 225/35R18Difference
30 mph30.0 mph29.7 mph−0.3 mph
60 mph60.0 mph59.4 mph−0.6 mph
75 mph75.0 mph74.3 mph−0.7 mph

Ride-height change: 225/35R18 lowers the vehicle by 0.12 in (3.1 mm) at the axle (half the −6.2 mm diameter difference).

225/35R18 is 0.24 in shorter than 195/55R16 and 30 mm wider, a 1.00% difference in overall diameter.

With the speedometer calibrated for 195/55R16, an indicated 60 mph is actually 59.4 mph on 225/35R18, and revolutions per mile change from 825 to 833.

225/35R18 mounts on a 18-inch wheel, a plus-2 fitment from the 16-inch wheel of 195/55R16.

Size pages

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Source: Calculated from standard tire geometry formulas. Verified . How these numbers are calculated.