235/70R22 vs 245/70R22
Going from one to the other changes the overall height by +1.6 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 235/70R22 | 245/70R22 | Change |
|---|---|---|---|
| Overall height | 35.0" | 35.5" | +1.6 % |
| Sidewall | 6.48" | 6.75" | +4.3 % |
| Section width | 235 mm | 245 mm | +4.3 % |
| Circumference | 109.8" | 111.5" | +1.6 % |
| Revs per mile | 577 | 568 | -1.6 % |
| Axle height | 17.48" | 17.75" | +7.0 mm |
| Approved rim width | 6.5–8.5" | 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 235/70R22. Fit 245/70R22 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.5 mph | +0.5 |
| 50 mph | 50.8 mph | +0.8 |
| 70 mph | 71.1 mph | +1.1 |
| 90 mph | 91.4 mph | +1.4 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,158 on the road, so it under-counts by 158. At a true 70 mph the first turns 673 times a minute, the second 663.