Tire Size vs. HP

[DaveHess]

Has anyone ever done a test where they dyno'ed a truck with 265 tires compared to same truck same set-up except with 285 tires? If you did, what was the difference? How about 245 to 285?

 

[MAllen1]

I've never done a dyno run, but, I could tell a difference when I went from a stock 245 to a 285 on my 99. I do "think" though that, after replacing the fan with a flexilite, I got pretty close to the way it was before.

 

[KVoigt]

When I had my truck on the dyno they told me HP would be the same, but torque numbers would be different with my 35's