Use the live comparison above to see the exact diameter, circumference, revs/mile, and speedometer error between 265/70R17 and 285/75R17. Change either size to explore a different pairing, or open the full Tire Size calculator to start from scratch.
Tire Size Comparison
265/70R17 vs 285/75R17
Diameter, circumference, revs/mile, and speedometer error for 265/70R17 vs 285/75R17, with a to-scale visual.
Metric (285/75R16) or inch (35x12.50R17)
Past +10% diameter, budget for a regear. Use the Gear Ratio calculator to check.
Tire Size Results
First Tire
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stock diameter
Second Tire
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new diameter
Speedo Error
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speedometer error
| Measurement | First | Second |
|---|
265/70R17 vs 285/75R17: What Changes
The 285/75R17 is a genuine 33-inch tire, so stepping up from a 265/70R17 is a bigger leap than it looks on paper: noticeably taller sidewall, more clearance, and a larger speedometer error. This is the size where many owners start budgeting for a small lift and keeping an eye on the ~10% diameter mark that signals a regear.
Frequently Asked Questions
Is 285/75R17 a 33-inch tire?
Yes. A 285/75R17 works out to roughly 33.8 inches in nominal diameter, which is why it is commonly sold and discussed as a 33.
Will my speedometer read wrong after this swap?
Yes, slightly. The taller 285/75R17 makes the speedometer read low; the exact percentage is shown in the results above, and a tuner or speedo recalibration corrects it.