Tire Size Box

305/25R19 vs 305/35R19

305/35R19 compared with 305/25R19

+9.6% diameter, 0.0" width

305/35R19 is 27.41" tall vs 25.00". More than the 3% rule of thumb, so check carefully before switching.

25.0"19" rim3.0"12.0" wide
305/25R19 (solid) compared with 305/35R19 (dashed outline), drawn to scale

With 305/35R19 tires, when your speedometer says 60 mph you are really going

65.8 mph

305/35R19 is +2.40 inches (+9.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/25R19305/35R19Difference%
Overall diameter25.00"27.41"+2.40"+9.6%
Section width12.01"12.01"0.00"0.0%
Sidewall height3.00"4.20"+1.20"+40.0%
Circumference78.55"86.10"+7.54"+9.6%
Revolutions per mile806.6735.9−70.7−8.8%

Speedometer difference

If your vehicle came with 305/25R19 and you fit 305/35R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.9 mph+1.9 mph
30 mph32.9 mph+2.9 mph
40 mph43.8 mph+3.8 mph
50 mph54.8 mph+4.8 mph
60 mph65.8 mph+5.8 mph
65 mph71.2 mph+6.2 mph
70 mph76.7 mph+6.7 mph
75 mph82.2 mph+7.2 mph
80 mph87.7 mph+7.7 mph

Each size on its own

Questions

Which is bigger, 305/25R19 or 305/35R19?
305/35R19 is taller by 2.40 inches (27.41" vs 25.00"). 305/25R19 is the same width.
Can I replace 305/25R19 with 305/35R19?
It is not recommended without checking carefully. The diameter difference is +9.6%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 305/35R19 change my speedometer?
When your speedometer reads 60 mph with 305/35R19 fitted (calibrated for 305/25R19), your real speed is 65.8 mph. Your odometer will under-count miles by about 9.6%.
Will 305/35R19 lift my vehicle?
Ride height changes by half the diameter difference: +1.20 inches of ground clearance at the axle.

Other comparisons