225/70R16 vs 245/60R16
Going from one to the other changes the overall height by -2.9 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 225/70R16 | 245/60R16 | Change |
|---|---|---|---|
| Overall height | 28.4" | 27.6" | -2.9 % |
| Sidewall | 6.20" | 5.79" | -6.7 % |
| Section width | 225 mm | 245 mm | +8.9 % |
| Circumference | 89.2" | 86.6" | -2.9 % |
| Revs per mile | 710 | 731 | +2.9 % |
| Axle height | 14.20" | 13.79" | -10.5 mm |
| Approved rim width | 6–8.5" | 7–9" | overlap 7–8.5" |
Both are approved on a rim 7" to 8.5" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 225/70R16. Fit 245/60R16 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.1 mph | -0.9 |
| 50 mph | 48.5 mph | -1.5 |
| 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 9,709 on the road, so it over-counts by 291. At a true 70 mph the first turns 828 times a minute, the second 853.
What drivers reported
225/70R16 carries 58 complaints. Nobody has filed one naming 245/60R16.