265/45R21 vs 245/50R21
Going from one to the other changes the overall height by +0.8 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 265/45R21 | 245/50R21 | Change |
|---|---|---|---|
| Overall height | 30.4" | 30.6" | +0.8 % |
| Sidewall | 4.69" | 4.82" | +2.7 % |
| Section width | 265 mm | 245 mm | -7.5 % |
| Circumference | 95.5" | 96.3" | +0.8 % |
| Revs per mile | 664 | 658 | -0.8 % |
| Axle height | 15.19" | 15.32" | +3.3 mm |
| Approved rim width | 7.5–9.5" | 7–9" | overlap 7.5–9" |
Both are approved on a rim 7.5" to 9" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 265/45R21. Fit 245/50R21 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 |
| 50 mph | 50.4 mph | +0.4 |
| 70 mph | 70.6 mph | +0.6 |
| 90 mph | 90.8 mph | +0.8 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,084 on the road, so it under-counts by 84. At a true 70 mph the first turns 774 times a minute, the second 768.
What drivers reported
265/45R21 carries 2 complaints. Nobody has filed one naming 245/50R21.