Need advice on rim choice!

[38SHO]

Its much more an issue of unsprung weight than it is rotational inertia. Also, the short tires that go on those 18" rims will weight less than the corresponding 16" tires, offsetting part of the added wheel weight.

Adding a bunch of unsprung weight results in the vehicle riding like a buckboard. I speak from experience....

<buzzer sound> WRONG

Fuzion ZRi 205-50-16

this would be the size I"d run for a lightweight wheel on a SHO

22lbs, even larger 16's are still lighter then the 17's

same tire 225-45-17 and 245-45-17
25lbs/27lbs respectively




you would think differently, you'd also think a bigger wheel tire would cost less since there is less material, or so appearing to the eye...... but the construction of the tire is heavier to make a smaller piece as strong as a bigger piece... I hope you kinda get that basic description


If I was running an 11 pound lighter wheel, and a 5 pound lighter tire, thats a 64 pound difference in rotational weight....... if you don't think that makes a difference, pass me what your smoking.... wait maybe I don't want any of that... I got my own that keeps me with normal thoughts.........


edit*

and beyond that, shit I'd just like to have the 64 pound weight loss........ thats like changing seats right there

 

[jthod]

Granite the run with the 16's was a much better 60' but I think the hoosier helped there. I get that every little bit helps.

granite must make that wheel heavy.

 

[jonmon6691]

So I just learned this in AP Physics... The rotational momentum of the wheel (i.e the power required to change its rotational velocity (i.e. how hard it is to turn)) is a function of its mass, and the location of that mass (i.e. how far it is from the rotating axis). That means that if two wheels weigh the same, the wheel with more of its weight inside will perform better than the wheel with more weight towards the rim.

so... total wheel weight isn't a really good way to compare the power that a wheel takes from your engine.