135/85R13 vs 145/80R13
Going from one to the other changes the overall height by +0.4 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 135/85R13 | 145/80R13 | Change |
|---|---|---|---|
| Overall height | 22.0" | 22.1" | +0.4 % |
| Sidewall | 4.52" | 4.57" | +1.1 % |
| Section width | 135 mm | 145 mm | +7.4 % |
| Circumference | 69.2" | 69.5" | +0.4 % |
| Revs per mile | 915 | 911 | -0.4 % |
| Axle height | 11.02" | 11.07" | +1.3 mm |
| Approved rim width | 3.5–5" | 4–5.5" | overlap 4–5" |
Both are approved on a rim 4" to 5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 135/85R13. Fit 145/80R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 |
| 50 mph | 50.2 mph | +0.2 |
| 70 mph | 70.3 mph | +0.3 |
| 90 mph | 90.4 mph | +0.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,045 on the road, so it under-counts by 45. At a true 70 mph the first turns 1068 times a minute, the second 1063.
What drivers reported
Nobody has filed a complaint naming 135/85R13. 145/80R13 carries 1.