225/65R19.5 vs 225/70R19.5
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 | 225/65R19.5 | 225/70R19.5 | Change |
|---|---|---|---|
| Overall height | 31.0" | 31.9" | +2.9 % |
| Sidewall | 5.76" | 6.20" | +7.7 % |
| Section width | 225 mm | 225 mm | 0.0 % |
| Circumference | 97.4" | 100.2" | +2.9 % |
| Revs per mile | 650 | 632 | -2.9 % |
| Axle height | 15.51" | 15.95" | +11.3 mm |
| Approved rim width | 6–8.5" | 6–8.5" | overlap 6–8.5" |
Both are approved on a rim 6" 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 225/65R19.5. Fit 225/70R19.5 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 10,286 on the road, so it under-counts by 286. At a true 70 mph the first turns 759 times a minute, the second 738.
What drivers reported
Nobody has filed a complaint naming 225/65R19.5. 225/70R19.5 carries 20.