TireSizesFinder

245/55R17 vs 305/35R19

305/35R19 is 0.20 in (5.2 mm) shorter than 245/55R17, a −0.74% diameter difference. With the speedometer set for 245/55R17, an indicated 60 mph is 59.6 mph on 305/35R19.

Is this a safe swap?

Diameter difference −0.74%: under 1%

By overall diameter alone, 305/35R19 is a near match for 245/55R17; the speedometer changes by less than 1%. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 245/55R17 (27.61 in) vs 305/35R19 (27.41 in)245/55R1727.61 in × 9.65 in305/35R1927.41 in × 12.01 in
Side profile and tread width, drawn to the same scale.
245/55R17 vs 305/35R19 differences
Measurement245/55R17305/35R19Difference% diff
Overall diameter27.61 in (701.3 mm)27.41 in (696.1 mm)−0.20 in (−5.2 mm)−0.74%
Sidewall height5.31 in (134.8 mm)4.20 in (106.8 mm)−1.10 in (−28.0 mm)−20.78%
Section width9.65 in (245.0 mm)12.01 in (305.0 mm)+2.36 in (+60.0 mm)+24.49%
Circumference86.74 in (2,203.2 mm)86.10 in (2,186.9 mm)−0.64 in (−16.3 mm)−0.74%
Revolutions per mile730736+5+0.75%
True speed with the speedometer calibrated for 245/55R17
IndicatedActual on 245/55R17Actual on 305/35R19Difference
30 mph30.0 mph29.8 mph−0.2 mph
60 mph60.0 mph59.6 mph−0.4 mph
75 mph75.0 mph74.4 mph−0.6 mph

Ride-height change: 305/35R19 lowers the vehicle by 0.10 in (2.6 mm) at the axle (half the −5.2 mm diameter difference).

305/35R19 is 0.20 in shorter than 245/55R17 and 60 mm wider, a 0.74% difference in overall diameter.

With the speedometer calibrated for 245/55R17, an indicated 60 mph is actually 59.6 mph on 305/35R19, and revolutions per mile change from 730 to 736.

305/35R19 mounts on a 19-inch wheel, a plus-2 fitment from the 17-inch wheel of 245/55R17.

Size pages

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