245/60R17 vs 225/70R17
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 | 245/60R17 | 225/70R17 | Change |
|---|---|---|---|
| Overall height | 28.6" | 29.4" | +2.9 % |
| Sidewall | 5.79" | 6.20" | +7.1 % |
| Section width | 245 mm | 225 mm | -8.2 % |
| Circumference | 89.8" | 92.4" | +2.9 % |
| Revs per mile | 706 | 686 | -2.9 % |
| Axle height | 14.29" | 14.70" | +10.5 mm |
| Approved rim width | 7–9" | 6–8.5" | 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 245/60R17. Fit 225/70R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.9 mph | +0.9 |
| 50 mph | 51.4 mph | +1.4 |
| 70 mph | 72.0 mph | +2.0 |
| 90 mph | 92.6 mph | +2.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,289 on the road, so it under-counts by 289. At a true 70 mph the first turns 823 times a minute, the second 800.
What drivers reported
Nobody has filed a complaint naming 245/60R17. 225/70R17 carries 8.