215/75R15 vs 235/75R15: full comparison
| Measurement | 215/75R15 | 235/75R15 | Difference |
|---|---|---|---|
| Diameter | 27.70 in | 28.88 in | +1.18 in+4.3% |
| Section width | 8.46 in | 9.25 in | +0.79 in+9.3% |
| Sidewall height | 6.35 in | 6.94 in | +0.59 in+9.3% |
| Circumference | 87.01 in | 90.72 in | +3.71 in+4.3% |
| Revs per mile | 728 | 698 | −30−4.1% |
Speedometer: indicated vs actual speed
With 235/75R15 fitted where 215/75R15 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.9 mph | +0.9 mph |
| 30 mph | 31.3 mph | +1.3 mph |
| 40 mph | 41.7 mph | +1.7 mph |
| 50 mph | 52.1 mph | +2.1 mph |
| 55 mph | 57.3 mph | +2.3 mph |
| 60 mph | 62.6 mph | +2.6 mph |
| 65 mph | 67.8 mph | +2.8 mph |
| 70 mph | 73.0 mph | +3.0 mph |
| 75 mph | 78.2 mph | +3.2 mph |
| 80 mph | 83.4 mph | +3.4 mph |
Recalculate for a gear ratio change too →
Will 235/75R15 fit where 215/75R15 was?
At +4.3%, 235/75R15 is enough larger than 215/75R15 that it commonly needs some accommodation -- trimming plastic liners/fender edges, a spacer, or a leveling kit on trucks/SUVs going bigger. Check clearance at full steering lock and full suspension compression before buying.
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- Speedometer calculator: true speed after a tire or gear ratio change.
Frequently asked questions
How much bigger is 235/75R15 than 215/75R15?
235/75R15 is 1.18 in taller in overall diameter (+4.3%) and 0.79 in wider in section width (+9.3%) than 215/75R15.
Will 235/75R15 fit in place of 215/75R15?
At +4.3%, 235/75R15 is enough larger than 215/75R15 that it commonly needs some accommodation -- trimming plastic liners/fender edges, a spacer, or a leveling kit on trucks/SUVs going bigger. Check clearance at full steering lock and full suspension compression before buying.
Does swapping to 235/75R15 affect my speedometer?
With 235/75R15 fitted where 215/75R15 was calibrated, an indicated 60 mph is really about 62.6 mph. Beyond the ±3% guideline, plan to recalibrate the speedometer/odometer (with a programmer or at the dealer) for an accurate reading.
Does 235/75R15 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 235/75R15 changes ride height by about 0.59 in higher compared with 215/75R15.
Do 215/75R15 and 235/75R15 use the same wheel (rim) diameter?
Yes -- both fit a 15 inch wheel, so only the tire itself changes, not the wheel.