Suppose you could get a rim and tire combo that is the same weight but almost 2 inches narrower than the stock tires. Would this have any benefit over the stock setup?


I have 2 rims and tires off a F150 regular that have 235/60/16 tires. I just weighed these and the stock setup on an 04 L and it was the same weight BUT it was 2 inches narrower.

Would it be a smart move to change these out at the track on the fronts for less rotating mass?

 

The less rubber on the road up front, the less rolling resistance.

Ideally, you want the front tires to be lighter and more narrow. But, with your setup you'd at least have the narrow part.

 

You're right in looking at the rotating portion of the wheels/tires. The key is where the mass is located. The further out from the center the mass is, the more rotating inertia the wheel/tire has.

Even with the same overall weight, I would guess the 16 inch combo is the better choice for you.

 

You said narrower but what about the diameter?
A smaller diameter will allow you to stage a bit deeper which will cut your track time.
The only real way to find out is to make some passes with them and see if you are faster.
Just as a safety tip, make sure they are the correct speed rating for an L if they came off a regular truck.

 

Thanks guys I guess I will take it and find out for sure.
I just need them rated for at least 120mph I am not going any faster I am sure!!

I'll report the findings once I go to the track.

 

uh, i think you have it backwards. staging deeper may help reduce reaction time but wil increase ETs. you get a "running start" so to speak, when you stage more shallow.