145/80R13 vs 155/80R13

155/80R13 is 0.63 in (16.0 mm) taller than 145/80R13, a +2.85% diameter difference. With the speedometer set for 145/80R13, an indicated 60 mph is 61.7 mph on 155/80R13.

Is this a safe swap?

Diameter difference +2.85%: within the ±3% guideline

By overall diameter alone, 155/80R13 falls inside the ±3% range commonly used as a guideline when replacing 145/80R13. This check uses diameter only. It does not assess load index, speed rating, wheel width or clearance.

Side profile and tread width, drawn to the same scale.

145/80R13 vs 155/80R13 differences
Measurement	145/80R13	155/80R13	Difference	% diff
Overall diameter	22.13 in (562.2 mm)	22.76 in (578.2 mm)	+0.63 in (+16.0 mm)	+2.85%
Sidewall height	4.57 in (116.0 mm)	4.88 in (124.0 mm)	+0.31 in (+8.0 mm)	+6.90%
Section width	5.71 in (145.0 mm)	6.10 in (155.0 mm)	+0.39 in (+10.0 mm)	+6.90%
Circumference	69.54 in (1,766.2 mm)	71.51 in (1,816.5 mm)	+1.98 in (+50.3 mm)	+2.85%
Revolutions per mile	911	886	−25	−2.77%

True speed with the speedometer calibrated for 145/80R13
Indicated	Actual on 145/80R13	Actual on 155/80R13	Difference
30 mph	30.0 mph	30.9 mph	+0.9 mph
60 mph	60.0 mph	61.7 mph	+1.7 mph
75 mph	75.0 mph	77.1 mph	+2.1 mph

Ride-height change: 155/80R13 raises the vehicle by 0.31 in (8.0 mm) at the axle (half the +16.0 mm diameter difference).

155/80R13 is 0.63 in taller than 145/80R13 and 10 mm wider, a 2.85% difference in overall diameter.

With the speedometer calibrated for 145/80R13, an indicated 60 mph is actually 61.7 mph on 155/80R13, and revolutions per mile change from 911 to 886.

Both sizes mount on 13-inch wheels.

Size pages

Other comparisons with 145/80R13

Other comparisons with 155/80R13

Source: Calculated from standard tire geometry formulas. Verified 2026-09-27. How these numbers are calculated.