315/45R23 vs 295/50R23
Going from one to the other changes the overall height by +1.3 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 315/45R23 | 295/50R23 | Change |
|---|---|---|---|
| Overall height | 34.2" | 34.6" | +1.3 % |
| Sidewall | 5.58" | 5.81" | +4.1 % |
| Section width | 315 mm | 295 mm | -6.3 % |
| Circumference | 107.3" | 108.7" | +1.3 % |
| Revs per mile | 590 | 583 | -1.3 % |
| Axle height | 17.08" | 17.31" | +5.8 mm |
| Approved rim width | 8.5–11.5" | 8.5–11" | overlap 8.5–11" |
Both are approved on a rim 8.5" to 11" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 315/45R23. Fit 295/50R23 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.4 mph | +0.4 |
| 50 mph | 50.7 mph | +0.7 |
| 70 mph | 70.9 mph | +0.9 |
| 90 mph | 91.2 mph | +1.2 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,133 on the road, so it under-counts by 133. At a true 70 mph the first turns 689 times a minute, the second 680.