175/60R13 vs 165/65R13
Going from one to the other changes the overall height by +0.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 175/60R13 | 165/65R13 | Change |
|---|---|---|---|
| Overall height | 21.3" | 21.4" | +0.8 % |
| Sidewall | 4.13" | 4.22" | +2.1 % |
| Section width | 175 mm | 165 mm | -5.7 % |
| Circumference | 66.8" | 67.4" | +0.8 % |
| Revs per mile | 948 | 940 | -0.8 % |
| Axle height | 10.63" | 10.72" | +2.3 mm |
| Approved rim width | 5–6" | 4.5–6" | overlap 5–6" |
Both are approved on a rim 5" to 6" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 175/60R13. Fit 165/65R13 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.2 mph | +0.2 |
| 50 mph | 50.4 mph | +0.4 |
| 70 mph | 70.6 mph | +0.6 |
| 90 mph | 90.7 mph | +0.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,083 on the road, so it under-counts by 83. At a true 70 mph the first turns 1106 times a minute, the second 1097.