Tire Size Box

295/40R22 vs 295/45R22

295/45R22 compared with 295/40R22

+3.7% diameter, 0.0" width

295/45R22 is 32.45" tall vs 31.29". More than the 3% rule of thumb, so check carefully before switching.

31.3"22" rim4.6"11.6" wide
295/40R22 (solid) compared with 295/45R22 (dashed outline), drawn to scale

With 295/45R22 tires, when your speedometer says 60 mph you are really going

62.2 mph

295/45R22 is +1.16 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/40R22295/45R22Difference%
Overall diameter31.29"32.45"+1.16"+3.7%
Section width11.61"11.61"0.00"0.0%
Sidewall height4.65"5.23"+0.58"+12.5%
Circumference98.30"101.95"+3.65"+3.7%
Revolutions per mile644.5621.5−23.1−3.6%

Speedometer difference

If your vehicle came with 295/40R22 and you fit 295/45R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.9 mph+1.9 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 295/40R22 or 295/45R22?
295/45R22 is taller by 1.16 inches (32.45" vs 31.29"). 295/40R22 is the same width.
Can I replace 295/40R22 with 295/45R22?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 295/45R22 change my speedometer?
When your speedometer reads 60 mph with 295/45R22 fitted (calibrated for 295/40R22), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 295/45R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.58 inches of ground clearance at the axle.

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