33x12.50R17 vs 285/75R17
285/75R17 is 2.5% taller (+0.83 in) and 1.28 in narrower than 33x12.50R17.
285/75R17 is 2.5% taller than 33x12.50R17. That is inside the ±3% most shops treat as a straight swap.
| 33x12.50R17 | 285/75R17 | Change | |
|---|---|---|---|
| Diameter | 33.00″ | 33.83″ | +0.83″+2.5% |
| Width | 12.50″ | 11.22″ | −1.28″−10.2% |
| Sidewall | 8.00″ | 8.42″ | +0.42″+5.2% |
| Circumference | 103.7″ | 106.3″ | +2.6″+2.5% |
| Wheel | 17″ | 17″ | Same |
| Revs per mile | 611 | 596 | −15 |
Real speed on 285/75R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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33x12.50R17 or 285/75R17?
Can I use 285/75R17 instead of 33x12.50R17?
285/75R17 is 2.5% taller than 33x12.50R17. That is inside the ±3% most shops treat as a straight swap. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.
Will my speedometer be off?
At an indicated 60 mph on 285/75R17 you are really doing 61.5 mph if the speedometer was set up for 33x12.50R17. Going the other way, 33x12.50R17 would make it read 58.5 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.42 in (+11 mm) under the axle.