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155/65R14 vs 165/65R14

Side-by-side comparison of overall diameter, sidewall height, speedometer error, and ride-height change.

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To scale

ground13.0 mm155/65R14557.1 mm165/65R14570.1 mm

155/65R14

Section width
155 mm
Aspect ratio
65%
Rim diameter
14"
Sidewall
100.8 mm
Overall diameter
557.1 mm
Circumference
1750 mm
Revs / mile
920
Revs / km
571

165/65R14

Section width
165 mm
Aspect ratio
65%
Rim diameter
14"
Sidewall
107.3 mm
Overall diameter
570.1 mm
Circumference
1791 mm
Revs / mile
899
Revs / km
558

Difference

Overall diameter
+13.0 mm (+2.33%)
Sidewall height
+6.5 mm
Tread width
+10 mm
Ride height (axle)
+6.5 mm
Speedometer error
+2.33%
At indicated 60 mph
actual 61.4 mph
At indicated 100 km/h
actual 102.3 km/h

Will 165/65R14 fit instead of 155/65R14?

The overall diameter changes by 2.33%. Most manufacturers consider a swap acceptable when the difference stays under 3% — beyond that, you may see speedometer error, ABS/TPMS warnings, or wheel-well clearance problems. This page only covers the math; your vehicle's wheel arches, suspension geometry, and load rating still matter.

What the numbers mean