275/60R20 vs 33x12.50R20: full comparison
| Measurement | 275/60R20 | 33x12.50R20 | Difference |
|---|---|---|---|
| Diameter | 32.99 in | 33.00 in | +0.01 in0.0% |
| Section width | 10.83 in | 12.50 in | +1.67 in+15.5% |
| Sidewall height | 6.50 in | 6.50 in | 0.00 in+0.1% |
| Circumference | 103.65 in | 103.67 in | +0.02 in0.0% |
| Revs per mile | 611 | 611 | 00.0% |
Speedometer: indicated vs actual speed
With 33x12.50R20 fitted where 275/60R20 was the stock/calibrated size:
| Speedometer shows | Actual speed | Difference |
|---|---|---|
| 20 mph | 20.0 mph | 0.0 mph |
| 30 mph | 30.0 mph | 0.0 mph |
| 40 mph | 40.0 mph | 0.0 mph |
| 50 mph | 50.0 mph | 0.0 mph |
| 55 mph | 55.0 mph | 0.0 mph |
| 60 mph | 60.0 mph | 0.0 mph |
| 65 mph | 65.0 mph | 0.0 mph |
| 70 mph | 70.0 mph | 0.0 mph |
| 75 mph | 75.0 mph | 0.0 mph |
| 80 mph | 80.0 mph | 0.0 mph |
Recalculate for a gear ratio change too →
Will 33x12.50R20 fit where 275/60R20 was?
275/60R20 and 33x12.50R20 are essentially the same overall height (0.0%), so this is usually a straightforward swap as far as fitment goes -- the main thing to check is wheel width and offset, not diameter.
Related tire size comparisons
- 275/55R20 vs 275/60R20
- 275/60R20 vs 285/55R20
- 275/55R20 vs 33x12.50R20
- 275/60R20 vs 305/55R20
- 295/65R20 vs 33x12.50R20
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 275/60R20?
33x12.50R20 is 0.01 in taller in overall diameter (0.0%) and 1.67 in wider in section width (+15.5%) than 275/60R20.
Will 33x12.50R20 fit in place of 275/60R20?
275/60R20 and 33x12.50R20 are essentially the same overall height (0.0%), so this is usually a straightforward swap as far as fitment goes -- the main thing to check is wheel width and offset, not diameter.
Does swapping to 33x12.50R20 affect my speedometer?
Since the two sizes are almost the same height, your speedometer will read essentially correctly either way. That small a difference is within the ±3% most shops treat as close enough not to recalibrate.
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 0.00 in higher compared with 275/60R20.
Can I compare a metric size (like 275/60R20) 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.