145/80R13 vs 135/80R13
Going from one to the other changes the overall height by -2.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 145/80R13 | 135/80R13 | Change |
|---|---|---|---|
| Overall height | 22.1" | 21.5" | -2.8 % |
| Sidewall | 4.57" | 4.25" | -6.9 % |
| Section width | 145 mm | 135 mm | -6.9 % |
| Circumference | 69.5" | 67.6" | -2.8 % |
| Revs per mile | 911 | 938 | +2.8 % |
| Axle height | 11.07" | 10.75" | -8.0 mm |
| Approved rim width | 4–5.5" | 3.5–5" | 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 145/80R13. Fit 135/80R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.6 mph | -1.4 |
| 70 mph | 68.0 mph | -2.0 |
| 90 mph | 87.4 mph | -2.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,715 on the road, so it over-counts by 285. At a true 70 mph the first turns 1063 times a minute, the second 1094.
What drivers reported
145/80R13 carries 1 complaints. Nobody has filed one naming 135/80R13.