Tire Size Box

305/35R19 vs 295/40R19

295/40R19 compared with 305/35R19

+3.2% diameter, −0.4" width

295/40R19 is 28.29" tall vs 27.41". More than the 3% rule of thumb, so check carefully before switching.

27.4"19" rim4.2"12.0" wide
305/35R19 (solid) compared with 295/40R19 (dashed outline), drawn to scale

With 295/40R19 tires, when your speedometer says 60 mph you are really going

61.9 mph

295/40R19 is +0.89 inches (+3.2%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/35R19295/40R19Difference%
Overall diameter27.41"28.29"+0.89"+3.2%
Section width12.01"11.61"−0.39"−3.3%
Sidewall height4.20"4.65"+0.44"+10.5%
Circumference86.10"88.88"+2.78"+3.2%
Revolutions per mile735.9712.9−23.0−3.1%

Speedometer difference

If your vehicle came with 305/35R19 and you fit 295/40R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph31.0 mph+1.0 mph
40 mph41.3 mph+1.3 mph
50 mph51.6 mph+1.6 mph
60 mph61.9 mph+1.9 mph
65 mph67.1 mph+2.1 mph
70 mph72.3 mph+2.3 mph
75 mph77.4 mph+2.4 mph
80 mph82.6 mph+2.6 mph

Each size on its own

Questions

Which is bigger, 305/35R19 or 295/40R19?
295/40R19 is taller by 0.89 inches (28.29" vs 27.41"). 305/35R19 is wider by 0.39 inches.
Can I replace 305/35R19 with 295/40R19?
It is not recommended without checking carefully. The diameter difference is +3.2%, 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 295/40R19 change my speedometer?
When your speedometer reads 60 mph with 295/40R19 fitted (calibrated for 305/35R19), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.2%.
Will 295/40R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.44 inches of ground clearance at the axle.

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