295/40R21 vs 275/45R21
Going from one to the other changes the overall height by +1.5 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 295/40R21 | 275/45R21 | Change |
|---|---|---|---|
| Overall height | 30.3" | 30.7" | +1.5 % |
| Sidewall | 4.65" | 4.87" | +4.9 % |
| Section width | 295 mm | 275 mm | -6.8 % |
| Circumference | 95.2" | 96.6" | +1.5 % |
| Revs per mile | 666 | 656 | -1.5 % |
| Axle height | 15.15" | 15.37" | +5.8 mm |
| Approved rim width | 8.5–11" | 7.5–10" | overlap 8.5–10" |
Both are approved on a rim 8.5" to 10" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 295/40R21. Fit 275/45R21 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 | 71.0 mph | +1.0 |
| 90 mph | 91.3 mph | +1.3 |
The odometer drifts with it. Ten thousand miles on the dial are really 10,149 on the road, so it under-counts by 149. At a true 70 mph the first turns 777 times a minute, the second 765.
What drivers reported
295/40R21 carries 2 complaints. Nobody has filed one naming 275/45R21.