[Hetts]

17's are not going to be as bad as 18's, i believe the rotational intertia of a ring (which a rim isnt exactly, almost a cross between a disk and a ring) is 1/2 mr^2. A solid disk is just mr^2, So i guess the rotational intertia of a rim would be somewhere inbetween the two, depends on the design, But reguardless...


What to take from the equation? Its going to get harder to turn the wheel as you add length to the radius... more so then adding mass, because radius is squared. People seem to make a bigger deal about getting light weight rims then getting smaller rims, should be the other way around.

 

[Hetts]

Obviously it's going to be better to have lower profile tires, less weight. The bigger the radius the slower it gets. Mass (weight) comes second to radius.

With the increased torque from a FI application, i dont think that you will see much of a difference from an added inch of rim. Maybe a tenth or two in a 1/4 mile. That's just my estimate, though.