165/65R15 vs 175/60R15
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 | 165/65R15 | 175/60R15 | Change |
|---|---|---|---|
| Overall height | 23.4" | 23.3" | -0.8 % |
| Sidewall | 4.22" | 4.13" | -2.1 % |
| Section width | 165 mm | 175 mm | +6.1 % |
| Circumference | 73.7" | 73.1" | -0.8 % |
| Revs per mile | 860 | 867 | +0.8 % |
| Axle height | 11.72" | 11.63" | -2.3 mm |
| Approved rim width | 4.5–6" | 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 165/65R15. Fit 175/60R15 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.8 mph | -0.2 |
| 50 mph | 49.6 mph | -0.4 |
| 70 mph | 69.5 mph | -0.5 |
| 90 mph | 89.3 mph | -0.7 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,924 on the road, so it over-counts by 76. At a true 70 mph the first turns 1004 times a minute, the second 1011.