Tire Size Box

235/35R22 vs 235/45R22

235/45R22 compared with 235/35R22

+6.5% diameter, 0.0" width

235/45R22 is 30.33" tall vs 28.48". More than the 3% rule of thumb, so check carefully before switching.

28.5"22" rim3.2"9.3" wide
235/35R22 (solid) compared with 235/45R22 (dashed outline), drawn to scale

With 235/45R22 tires, when your speedometer says 60 mph you are really going

63.9 mph

235/45R22 is +1.85 inches (+6.5%) in overall diameter. That is more than the 3% most shops and makers recommend.

235/35R22235/45R22Difference%
Overall diameter28.48"30.33"+1.85"+6.5%
Section width9.25"9.25"0.00"0.0%
Sidewall height3.24"4.16"+0.93"+28.6%
Circumference89.46"95.27"+5.81"+6.5%
Revolutions per mile708.2665.0−43.2−6.1%

Speedometer difference

If your vehicle came with 235/35R22 and you fit 235/45R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.3 mph+1.3 mph
30 mph31.9 mph+1.9 mph
40 mph42.6 mph+2.6 mph
50 mph53.2 mph+3.2 mph
60 mph63.9 mph+3.9 mph
65 mph69.2 mph+4.2 mph
70 mph74.5 mph+4.5 mph
75 mph79.9 mph+4.9 mph
80 mph85.2 mph+5.2 mph

Each size on its own

Questions

Which is bigger, 235/35R22 or 235/45R22?
235/45R22 is taller by 1.85 inches (30.33" vs 28.48"). 235/35R22 is the same width.
Can I replace 235/35R22 with 235/45R22?
It is not recommended without checking carefully. The diameter difference is +6.5%, 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 235/45R22 change my speedometer?
When your speedometer reads 60 mph with 235/45R22 fitted (calibrated for 235/35R22), your real speed is 63.9 mph. Your odometer will under-count miles by about 6.5%.
Will 235/45R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.93 inches of ground clearance at the axle.

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