TireSizesFinder

195/55R16 vs 215/35R18

215/35R18 is 0.52 in (13.2 mm) shorter than 195/55R16, a −2.13% diameter difference. With the speedometer set for 195/55R16, an indicated 60 mph is 58.7 mph on 215/35R18.

Is this a safe swap?

Diameter difference −2.13%: within the ±3% guideline

By overall diameter alone, 215/35R18 falls inside the ±3% range commonly used as a guideline when replacing 195/55R16. 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 215/35R18 (23.93 in)195/55R1624.44 in × 7.68 in215/35R1823.93 in × 8.46 in
Side profile and tread width, drawn to the same scale.
195/55R16 vs 215/35R18 differences
Measurement195/55R16215/35R18Difference% diff
Overall diameter24.44 in (620.9 mm)23.93 in (607.7 mm)−0.52 in (−13.2 mm)−2.13%
Sidewall height4.22 in (107.3 mm)2.96 in (75.3 mm)−1.26 in (−32.0 mm)−29.84%
Section width7.68 in (195.0 mm)8.46 in (215.0 mm)+0.79 in (+20.0 mm)+10.26%
Circumference76.80 in (1,950.6 mm)75.16 in (1,909.1 mm)−1.63 in (−41.5 mm)−2.13%
Revolutions per mile825843+18+2.17%
True speed with the speedometer calibrated for 195/55R16
IndicatedActual on 195/55R16Actual on 215/35R18Difference
30 mph30.0 mph29.4 mph−0.6 mph
60 mph60.0 mph58.7 mph−1.3 mph
75 mph75.0 mph73.4 mph−1.6 mph

Ride-height change: 215/35R18 lowers the vehicle by 0.26 in (6.6 mm) at the axle (half the −13.2 mm diameter difference).

215/35R18 is 0.52 in shorter than 195/55R16 and 20 mm wider, a 2.13% difference in overall diameter.

With the speedometer calibrated for 195/55R16, an indicated 60 mph is actually 58.7 mph on 215/35R18, and revolutions per mile change from 825 to 843.

215/35R18 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.