Jan 11, 2026 · Kansas
Replacing all six on a dually and I want the size the truck came with rather than what the last owner fitted. Does the build data carry the tire specification, or only the wheel?
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How do I find the factory tire size from the build data?
RPO — Tire identification code. This code identifies the factory-installed tire specification. Browse RPO codes →
3 replies
Jan 15, 2026
Both are usually there. Tires have their own code separate from the wheel code, and the description carries the size.
4 likes
Jan 18, 2026
On a heavy duty truck also check the load rating on the door label. The build code gives you size, the label gives you what the vehicle is rated to carry, and you want both to line up.
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Jan 24, 2026
Good point, they did not match what is on it now. Going back to the factory spec.
1 likes
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