135/80R13 vs 155/70R13
Going from one to the other changes the overall height by +0.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 135/80R13 | 155/70R13 | Change |
|---|---|---|---|
| Overall height | 21.5" | 21.5" | +0.2 % |
| Sidewall | 4.25" | 4.27" | +0.5 % |
| Section width | 135 mm | 155 mm | +14.8 % |
| Circumference | 67.6" | 67.7" | +0.2 % |
| Revs per mile | 938 | 936 | -0.2 % |
| Axle height | 10.75" | 10.77" | +0.5 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 135/80R13. Fit 155/70R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.1 mph | +0.1 |
| 50 mph | 50.1 mph | +0.1 |
| 70 mph | 70.1 mph | +0.1 |
| 90 mph | 90.2 mph | +0.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,018 on the road, so it under-counts by 18. At a true 70 mph the first turns 1094 times a minute, the second 1092.