145/60R14 vs 165/50R14
Going from one to the other changes the overall height by -1.7 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 145/60R14 | 165/50R14 | Change |
|---|---|---|---|
| Overall height | 20.9" | 20.5" | -1.7 % |
| Sidewall | 3.43" | 3.25" | -5.2 % |
| Section width | 145 mm | 165 mm | +13.8 % |
| Circumference | 65.5" | 64.4" | -1.7 % |
| Revs per mile | 967 | 984 | +1.7 % |
| Axle height | 10.43" | 10.25" | -4.5 mm |
| Approved rim width | 4–5.5" | 4.5–6" | overlap 4.5–5.5" |
Both are approved on a rim 4.5" to 5.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 145/60R14. Fit 165/50R14 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.2 mph | -0.8 |
| 70 mph | 68.8 mph | -1.2 |
| 90 mph | 88.5 mph | -1.5 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,830 on the road, so it over-counts by 170. At a true 70 mph the first turns 1128 times a minute, the second 1148.