Simple question: Do the dimensions of your tires affect whp measurements? i.e. would running larger tires/smaller tires effect the power your make at the rear wheels? I would think yes, especially with running larger diameter tires (more mass to turn). I know that in most cases the difference would be negligable, due to the limits of the stock wheel wells' tire fitment (couldn't alter the diameter beyond a few inches), but hypothetically. Thanks to all for answers

 

TTT
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Just a second of your time: anyone?

 

Probably has a really small effect, from the difference in rolling resistance, & maybe the difference in rotational mass. (Depending on what kind of dyno.)

A brake dyno will see the difference in rolling resistance. An inertial dyno will see both those things.