Is there any 1/4 mi et drops with going with those light rims and skinnies up front?

 

Everyone I've seen try em and when I have tried them I gained and average of about a tenth and a hald a tenth.

 

I bracket race my car every weekend. Sometimes with the front runners, sometimes with normal rims. The difference is about .15

Weld Draglites with 165's

Bill

 

When I changed to skinnies I went to a taller tire so I have a longer rollout... About .05 in my opinion. How much was due to the rollut and how much due to the lighter rims and tires is anybodies guess.

 

Every 100lbs of dead weight is worth about 1/10th of a second.

Every 100lbs of of weight savings in your ROLLING STOCK, meaning your tires and wheels is worth about 3 times that much.

 

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The fronts aren't rotating mass. Though they DO rotate, they aren't linked to the motor, and aren't considered "rotating mass" in such an equation like the driveshaft, diff parts, axles, and rear wheels/tires are. The savings from skinnies are purely weight loss in the front, weight transfar, and less friction with the ground.

 

Spinner-
So you're saying that if I put some 300 pound wheels on the front of my car, that I'd only slow down about 3 tenths? I find that hard to believe.

Bill

 

No, I'm not. But losing 15 pounds on the front wheels isnt going to do as much for you as losing 15 on the rear because they're not driven by the motor, though they ARE rolling resistance.

 

The motor still has to roll the front wheels just as it rolls the back wheels. Although its not direct driver in the front, it still has to overcome their weight and resistance to accelerate.

I'm not an engineer tho .

Ryan

 

Exactly!! Anything that rotates when the car is moving has the same effect on the momentum. 15# off of the front wheel/tire has exactly the same effect on acceleration as 15# off of the rear wheels. Physical laws can't tell which end of the car they are on and the motor still has to use it's power to turn them.

I got a solid tenth and 1-1.5mph from the Bogarts and 165rs. And the weight difference was 34#.