345/35R21 vs 325/35R21
Going from one to the other changes the overall height by -1.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 345/35R21 | 325/35R21 | Change |
|---|---|---|---|
| Overall height | 30.5" | 30.0" | -1.8 % |
| Sidewall | 4.75" | 4.48" | -5.8 % |
| Section width | 345 mm | 325 mm | -5.8 % |
| Circumference | 95.8" | 94.1" | -1.8 % |
| Revs per mile | 661 | 673 | +1.8 % |
| Axle height | 15.25" | 14.98" | -7.0 mm |
| Approved rim width | 9.5–12.5" | 9–12" | overlap 9.5–12" |
Both are approved on a rim 9.5" to 12" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 345/35R21. Fit 325/35R21 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.5 mph | -0.5 |
| 50 mph | 49.1 mph | -0.9 |
| 70 mph | 68.7 mph | -1.3 |
| 90 mph | 88.4 mph | -1.6 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,819 on the road, so it over-counts by 181. At a true 70 mph the first turns 771 times a minute, the second 785.