TireSizesFinder

235/35R19 vs 275/30R19

275/30R19 is 0.02 in (0.5 mm) taller than 235/35R19, a +0.08% diameter difference. With the speedometer set for 235/35R19, an indicated 60 mph is 60.0 mph on 275/30R19.

Is this a safe swap?

Diameter difference +0.08%: under 1%

By overall diameter alone, 275/30R19 is a near match for 235/35R19; 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: 235/35R19 (25.48 in) vs 275/30R19 (25.50 in)235/35R1925.48 in × 9.25 in275/30R1925.50 in × 10.83 in
Side profile and tread width, drawn to the same scale.
235/35R19 vs 275/30R19 differences
Measurement235/35R19275/30R19Difference% diff
Overall diameter25.48 in (647.1 mm)25.50 in (647.6 mm)+0.02 in (+0.5 mm)+0.08%
Sidewall height3.24 in (82.3 mm)3.25 in (82.5 mm)+0.01 in (+0.3 mm)+0.30%
Section width9.25 in (235.0 mm)10.83 in (275.0 mm)+1.57 in (+40.0 mm)+17.02%
Circumference80.04 in (2,032.9 mm)80.10 in (2,034.5 mm)+0.06 in (+1.6 mm)+0.08%
Revolutions per mile792791−1−0.08%
True speed with the speedometer calibrated for 235/35R19
IndicatedActual on 235/35R19Actual on 275/30R19Difference
30 mph30.0 mph30.0 mph0.0 mph
60 mph60.0 mph60.0 mph0.0 mph
75 mph75.0 mph75.1 mph+0.1 mph

Ride-height change: 275/30R19 raises the vehicle by 0.01 in (0.3 mm) at the axle (half the +0.5 mm diameter difference).

275/30R19 is 0.02 in taller than 235/35R19 and 40 mm wider, a 0.08% difference in overall diameter.

With the speedometer calibrated for 235/35R19, an indicated 60 mph is actually 60.0 mph on 275/30R19, and revolutions per mile change from 792 to 791.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 235/35R19

Other comparisons with 275/30R19

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