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  #1  
Old 04-11-2003, 07:06 AM
AF AF is offline
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rotational mass question . . . if 2 wheels wieght the same but are different sizes

If 2 wheels weigh 50lbs each but one is a 18" wheel and the other is a 19" wheel, will the performance be the same if the overall diameter with the tire is the same ?

TIA
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  #2  
Old 04-11-2003, 07:09 AM
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Chris330Ci Chris330Ci is offline
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Alan, you have gone mad..! Why are you even asking this question..?! I assume you mean 18"f/19"r..?
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  #3  
Old 04-11-2003, 07:10 AM
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Nick325xiT 5spd Nick325xiT 5spd is offline
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There's a littl emore mass located farther from the hub with a 19" wheel, so you will likely experience marginally worse performance. On the other hand, the 18 might have a greater weight bias in the rim.

Much as I think 19s are ridiculous, I don't think there's a significant performance loss if both have the same weight. (If S-03s on 18s drove you nuts, is a shorter sidewll really a good idea?)
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  #4  
Old 04-11-2003, 07:23 AM
Johann Johann is offline
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  #5  
Old 04-11-2003, 07:31 AM
AF AF is offline
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Chris . . . me going nuts ? ? . . . OOOHHHH YYYEEEAAHH !!!

Imagine trying to buy wheels for over 2 months . . . First I bought the used set of wheels, then realized I should have bought brand new ones, then I ordered brand new ones only to find out they were on national backorder for over a month,

Then I finally gave up waiting and then ordered the Imagines, (another 2 week wait) and I thought I was done with the whole wheel buying thing and then I find out about the ones I just bought are not straight . . .

So now I am open to anything that DOESN'T weigh 58lbs
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  #6  
Old 04-11-2003, 07:35 AM
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How many sets of wheels does one person need?
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  #7  
Old 04-11-2003, 07:36 AM
AF AF is offline
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Quote:
Originally posted by Nick325xiT 5spd
There's a littl emore mass located farther from the hub with a 19" wheel, so you will likely experience marginally worse performance. On the other hand, the 18 might have a greater weight bias in the rim.

Much as I think 19s are ridiculous, I don't think there's a significant performance loss if both have the same weight. (If S-03s on 18s drove you nuts, is a shorter sidewll really a good idea?)
I never liked the 19's because I thought they looked too big but then I saw my friends white 330i and then drove it and not only was the ride very smooth and comfortable, but the look was really nice . . . much better then the pictures then to top it off, they wiegh less then the 18's I have . . .

Also, let me put this in big words I was wrong about the SO3's !!!!

I should really post a message on this since I am sure no one will read this one but since the dealer put the non-vibrating wheels on the front, the S03's have been much better. Between there excellent grip and the vibration problem, they were all over the road
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  #8  
Old 04-11-2003, 07:36 AM
AF AF is offline
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Originally posted by nate328Ci
How many sets of wheels does one person need?
As of next week, I will be down to only the M68's
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  #9  
Old 04-11-2003, 08:01 AM
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Ack Ack is offline
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Alan,

All of this b/c of the conversation we had two weeks ago about wheel weights and rotational mass. I feel bad now b/c I have put some other things in your head and they are making you nuts.

Go with 19's if you like them. I think the HM2's in 19 will look damn good on your car.

Just make sure when you do finally order these new wheels and tires that they are balanced properly and aren't bent.

If anyone has issues with performance loss, its me. I got over 150 lbs of audio hardware and wiring in my car. The CAI has helped me regain some of this loss but overall, the car is still quick enough for me. How often do you shift to redline and need all of this performance? I do it occasionally, so if the car is 1 second slower to 60 MPH its probably has more to do with my ability to shift than it is the performance loss from added weight.

I think you need a , it is Friday.
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  #10  
Old 04-11-2003, 04:13 PM
AF AF is offline
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Quote:
Originally posted by Ack

I think you need a , it is Friday.

I can use a drink anyday of the week

Thanks for the words of advice . . .my mind is almost made up, Monday I will decide for sure and place the order !!
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