295/65R20 vs 33x12.50R20: full comparison
| Measurement | 295/65R20 | 33x12.50R20 | Difference |
|---|---|---|---|
| Diameter | 35.10 in | 33.00 in | −2.10 in−6.0% |
| Section width | 11.61 in | 12.50 in | +0.89 in+7.6% |
| Sidewall height | 7.55 in | 6.50 in | −1.05 in−13.9% |
| Circumference | 110.26 in | 103.67 in | −6.59 in−6.0% |
| Revs per mile | 575 | 611 | +37+6.4% |
Speedometer: indicated vs actual speed
With 33x12.50R20 fitted where 295/65R20 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 18.8 mph | −1.2 mph |
| 30 mph | 28.2 mph | −1.8 mph |
| 40 mph | 37.6 mph | −2.4 mph |
| 50 mph | 47.0 mph | −3.0 mph |
| 55 mph | 51.7 mph | −3.3 mph |
| 60 mph | 56.4 mph | −3.6 mph |
| 65 mph | 61.1 mph | −3.9 mph |
| 70 mph | 65.8 mph | −4.2 mph |
| 75 mph | 70.5 mph | −4.5 mph |
| 80 mph | 75.2 mph | −4.8 mph |
Recalculate for a gear ratio change too →
Will 33x12.50R20 fit where 295/65R20 was?
At −6.0%, 33x12.50R20 is enough smaller than 295/65R20 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.
Related tire size comparisons
- 275/55R20 vs 33x12.50R20
- 275/60R20 vs 33x12.50R20
- 33x12.50R20 vs 305/55R20
- 33x12.50R20 vs 285/55R20
- 33x12.50R20 vs 35x12.50R20
More tire tools
- Tire size comparison tool: compare any two sizes yourself, including flotation sizes.
- Tire size calculator: full dimensions of one size, plus every equivalent size within 3%.
- Speedometer calculator: true speed after a tire or gear ratio change.
Frequently asked questions
How much bigger is 33x12.50R20 than 295/65R20?
33x12.50R20 is 2.10 in shorter in overall diameter (−6.0%) and 0.89 in wider in section width (+7.6%) than 295/65R20.
Will 33x12.50R20 fit in place of 295/65R20?
At −6.0%, 33x12.50R20 is enough smaller than 295/65R20 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 33x12.50R20 affect my speedometer?
With 33x12.50R20 fitted where 295/65R20 was calibrated, an indicated 60 mph is really about 56.4 mph. Beyond the ±3% guideline, plan to recalibrate the speedometer/odometer (with a programmer or at the dealer) for an accurate reading.
Does 33x12.50R20 change the ride height?
Yes -- half the diameter difference shows up at the axle, so 33x12.50R20 changes ride height by about 1.05 in lower compared with 295/65R20.
Can I compare a metric size (like 295/65R20) with a flotation size (like 33x12.50R20)?
Yes -- both are converted to inches and millimeters before comparing, so the diameter, width and speedometer numbers above are directly comparable regardless of which sizing system each tire uses.