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Slowing my car down with 18's?

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Old 10-03-2005, 12:10 AM
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Default Slowing my car down with 18's?

I've read that 18" wheels are for show and will noticably slow down your car. I own a 2001 1.8tqm with the 16" sport wheels. I heard they weigh about 20lbs, and my 18" rims weigh 24lbs. If the low profile tires are lighter, shouldn't the overall weight be equal or less to that of my stock set-up? Will i still notice a difference?
Old 10-03-2005, 12:44 AM
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Default Given the same width,tires for 18s will not be much lighter even if its lower profile...

and for 18" wheels, all the weight is concentrated further out, so there will be more centrifugal force while its spinning. That means that you will feel the difference MORE. So even if 18s and 16s weight the same, since 16s weight is more concentrated in the center, there will be less centrifugal force while its spinnig, making it easier to slow down and speed up. If you want your car to perform to the max, you want your wheels to be as small and as light as possible. I am actually playing with the idea of getting 17s for my S4 as track wheels. I found a set that will clear 14" brake...
Old 10-03-2005, 12:46 AM
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huh ?
Old 10-03-2005, 12:47 AM
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cliff note: 18 wheels almost always = heavier and will slow the car down more than 16s
Old 10-03-2005, 12:48 AM
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sounds logical
Old 10-03-2005, 03:17 AM
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Default I don't know a lot about this, but I would think that the weight would play a negligible role...

Instead I would look at the amount of torque needed to turn the wheels- A higher circumference needs more power to turn at the same rate as a lower one.
Old 10-03-2005, 03:28 AM
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Default Depends on how the weight is distributed in the wheel as well.

18" spinners will require more power to turn than 18" OZ Superleggera (fairly light wheel at the top of my mind).
Old 10-03-2005, 05:15 AM
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Default right idea, but incorrect terminology...its the moment of inertia not centrifugal force...

which is the reason why more mass at a larger radius is bad.
Old 10-03-2005, 05:20 AM
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Default wieght isnt a factor in acceleration as much as its distribution...

an 18" wheel/tire combo which weighs the <b>same</b> as a 16" wheel/tire combo will most likely be noticably slower.

in your case, you will notice a big difference.
Old 10-03-2005, 05:24 AM
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Default uhh dynamically balancing...

my first and only experience with that was frustrating...thank god i got moved off that program


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