Tire Size Box

145/80R13 vs 165/80R13

165/80R13 compared with 145/80R13

+5.7% diameter, +0.8" width

165/80R13 is 23.39" tall vs 22.13". More than the 3% rule of thumb, so check carefully before switching.

22.1"13" rim4.6"5.7" wide
145/80R13 (solid) compared with 165/80R13 (dashed outline), drawn to scale

With 165/80R13 tires, when your speedometer says 60 mph you are really going

63.4 mph

165/80R13 is +1.26 inches (+5.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

145/80R13165/80R13Difference%
Overall diameter22.13"23.39"+1.26"+5.7%
Section width5.71"6.50"+0.79"+13.8%
Sidewall height4.57"5.20"+0.63"+13.8%
Circumference69.54"73.49"+3.96"+5.7%
Revolutions per mile911.2862.1−49.1−5.4%

Speedometer difference

If your vehicle came with 145/80R13 and you fit 165/80R13, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.1 mph+1.1 mph
30 mph31.7 mph+1.7 mph
40 mph42.3 mph+2.3 mph
50 mph52.8 mph+2.8 mph
60 mph63.4 mph+3.4 mph
65 mph68.7 mph+3.7 mph
70 mph74.0 mph+4.0 mph
75 mph79.3 mph+4.3 mph
80 mph84.6 mph+4.6 mph

Each size on its own

Questions

Which is bigger, 145/80R13 or 165/80R13?
165/80R13 is taller by 1.26 inches (23.39" vs 22.13"). 165/80R13 is wider by 0.79 inches.
Can I replace 145/80R13 with 165/80R13?
It is not recommended without checking carefully. The diameter difference is +5.7%, 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 165/80R13 change my speedometer?
When your speedometer reads 60 mph with 165/80R13 fitted (calibrated for 145/80R13), your real speed is 63.4 mph. Your odometer will under-count miles by about 5.7%.
Will 165/80R13 lift my vehicle?
Ride height changes by half the diameter difference: +0.63 inches of ground clearance at the axle.

Other comparisons