TireSizesFinder

285/35R19 vs 305/35R19

305/35R19 is 0.55 in (14.0 mm) taller than 285/35R19, a +2.05% diameter difference. With the speedometer set for 285/35R19, an indicated 60 mph is 61.2 mph on 305/35R19.

Is this a safe swap?

Diameter difference +2.05%: within the ±3% guideline

By overall diameter alone, 305/35R19 falls inside the ±3% range commonly used as a guideline when replacing 285/35R19. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

To-scale drawing: 285/35R19 (26.85 in) vs 305/35R19 (27.41 in)285/35R1926.85 in × 11.22 in305/35R1927.41 in × 12.01 in
Side profile and tread width, drawn to the same scale.
285/35R19 vs 305/35R19 differences
Measurement285/35R19305/35R19Difference% diff
Overall diameter26.85 in (682.1 mm)27.41 in (696.1 mm)+0.55 in (+14.0 mm)+2.05%
Sidewall height3.93 in (99.8 mm)4.20 in (106.8 mm)+0.28 in (+7.0 mm)+7.02%
Section width11.22 in (285.0 mm)12.01 in (305.0 mm)+0.79 in (+20.0 mm)+7.02%
Circumference84.37 in (2,142.9 mm)86.10 in (2,186.9 mm)+1.73 in (+44.0 mm)+2.05%
Revolutions per mile751736−15−2.01%
True speed with the speedometer calibrated for 285/35R19
IndicatedActual on 285/35R19Actual on 305/35R19Difference
30 mph30.0 mph30.6 mph+0.6 mph
60 mph60.0 mph61.2 mph+1.2 mph
75 mph75.0 mph76.5 mph+1.5 mph

Ride-height change: 305/35R19 raises the vehicle by 0.28 in (7.0 mm) at the axle (half the +14.0 mm diameter difference).

305/35R19 is 0.55 in taller than 285/35R19 and 20 mm wider, a 2.05% difference in overall diameter.

With the speedometer calibrated for 285/35R19, an indicated 60 mph is actually 61.2 mph on 305/35R19, and revolutions per mile change from 751 to 736.

Both sizes mount on 19-inch wheels.

Size pages

Other comparisons with 285/35R19

Other comparisons with 305/35R19

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