235/50R21 vs 295/40R21 tire size
295/40R21 vs 235/50R21, diameter
+0.1% taller
- Speedometer
- 59.9 mph
- At a true 60 mph
- Diameter
- 30.29 in
- Was 30.25 in
- Revs per mile
- 666
- Was 667
- 3% guideline
- Within
Car built for 235/50R21, now on 295/40R21.
235/50R21 and 295/40R21
| Measure | 235/50R21 | 295/40R21 | Difference |
|---|---|---|---|
| Width, mm | 235 | 295 | +60 |
| Sidewall, % of width | 50 | 40 | -10 |
| Rim, in | 21 | 21 | 0 |
| Section height, in | 4.63 | 4.65 | +0.02 |
| Diameter, in | 30.25 | 30.29 | +0.04 (+0.1%) |
| Circumference, in | 95.0 | 95.2 | +0.1 |
| Revs per mile | 667 | 666 | -1 (-0.1%) |
Fitting 295/40R21 instead of 235/50R21
Within the usual 3% diameter guideline.
- 60 mm wider. Check rubbing at full lock.
Cars with 235/50R21
Cars with 295/40R21
What this cannot tell you
Diameter within 3% is a common shop guideline, not a maker spec.
Load index, offset and clearance are not in this data.
- Two or more sources agree
- One source
- Model-level or estimate
- Sources differ