Tire Size Box

145/85R13 vs 165/85R13

165/85R13 compared with 145/85R13

+5.9% diameter, +0.8" width

165/85R13 is 24.04" tall vs 22.70". More than the 3% rule of thumb, so check carefully before switching.

22.7"13" rim4.9"5.7" wide
145/85R13 (solid) compared with 165/85R13 (dashed outline), drawn to scale

With 165/85R13 tires, when your speedometer says 60 mph you are really going

63.5 mph

165/85R13 is +1.34 inches (+5.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

145/85R13165/85R13Difference%
Overall diameter22.70"24.04"+1.34"+5.9%
Section width5.71"6.50"+0.79"+13.8%
Sidewall height4.85"5.52"+0.67"+13.8%
Circumference71.33"75.53"+4.21"+5.9%
Revolutions per mile888.3838.8−49.5−5.6%

Speedometer difference

If your vehicle came with 145/85R13 and you fit 165/85R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.8 mph+1.8 mph
40 mph42.4 mph+2.4 mph
50 mph52.9 mph+2.9 mph
60 mph63.5 mph+3.5 mph
65 mph68.8 mph+3.8 mph
70 mph74.1 mph+4.1 mph
75 mph79.4 mph+4.4 mph
80 mph84.7 mph+4.7 mph

Each size on its own

Questions

Which is bigger, 145/85R13 or 165/85R13?
165/85R13 is taller by 1.34 inches (24.04" vs 22.70"). 165/85R13 is wider by 0.79 inches.
Can I replace 145/85R13 with 165/85R13?
It is not recommended without checking carefully. The diameter difference is +5.9%, 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 165/85R13 change my speedometer?
When your speedometer reads 60 mph with 165/85R13 fitted (calibrated for 145/85R13), your real speed is 63.5 mph. Your odometer will under-count miles by about 5.9%.
Will 165/85R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.67 inches of ground clearance at the axle.

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