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Is it my imagination? Every time I put my 16' rims on, my 2k1 seems to lost punch in acceleration.

 
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Common sense would tell you that the bigger the rim the more weight you are lugging around!!!

 
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Yes, it is slightly caused by the rotating mass, but it's because the change in the gear ratio due to the bigger rim and tire.

Pete

 
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put on some 13' or 12' you'll be chirpin first through 4th

 
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<< Yes, it is slightly caused by the rotating mass, but it's because the change in the gear ratio due to the bigger rim and tire. >>



Ahem... Change in gear ratio?



<< put on some 13' or 12' you'll be chirpin first through 4th >>



In theory yes, but 14" rims is as small as you can have in the front. The caliper won't fit on 13" rims.

The heavier the wheel, the more acceleration you'll lose. Also, the farther away that weight from the center of the wheel the more acceleration you'll lose. Also, the thinner the tire the more acceleration you'll lose. Tire flex prevents wheel spin.

 
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May I suggest this.

 
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<< put on some 13' or 12' you'll be chirpin first through 4th >>



and running out of engine room at 70mph

 
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Heavier rims suck. You should watch the weight of your rims, as the stock tires (on an EX) are already heavy! As from what I've been told... those 15s with the tires on them are approximately 43lbs?! Is that true? There are so many rims that weight less than that... the ones I plan on getting weigh 19lbs... with the tire added on there, I'm not sure what that equals up to but I know that the tire won't equal the same amount as the rim, right?

 
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I just weighed my stock wheels/tires off my EX. The bathroom scale sez about 37 pounds (no wheel cover or lugnuts). Of course, this is the same scale that tells me I weight 5 lbs less than what the calibrated scale at work tells me. [IMG]i/expressions/face-icon-small-blush.gif[/IMG]

Loss of acceleration is either:

A. Increase in rotational mass.
B. Increase in overall wheel/tire diameter.
C. Both

 
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Yep, heavy rims will cause you to lose some acceleration. It depends on what you like. A nice set of rims can really make the vic look awesome. I light set of rims may make it a bit faster. I am almost certain that the ex stock rim weighs 21.9lbs. Just remember that even if you buy a nice light-weight rim in say a 17in size, that 17in tire is going to be pretty darn heavy and may make up for the weight you saved over stock. It just depends on what you want.

 
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I'm stickin 16s...

I also heard your top speed increases with heavier rims. (Ha! Torque at the cost of HP... [IMG]i/expressions/face-icon-small-tongue.gif[/IMG])

 
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<< Heavier rims suck. You should watch the weight of your rims, as the stock tires (on an EX) are already heavy! As from what I've been told... those 15s with the tires on them are approximately 43lbs?! Is that true? There are so many rims that weight less than that... the ones I plan on getting weigh 19lbs... with the tire added on there, I'm not sure what that equals up to but I know that the tire won't equal the same amount as the rim, right? >>



Yes, the tires and the rims together weigh approximately 43lbs. If you're getting 17" rims that weigh 19lbs, then the rubber for those will weigh another 25lbs! That's a total of 44lbs! More than stock. For example, 18" Kosei RT Penta's with 215/25/18 Kumho Ecsta 712's weighs the same as stock.

 
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I ran my car last night on stock tires(fornt anyways) and on 17's.
Stock: 16.72
17s: 17.34
Damn LX.............
I ran 3 times on the 17's and that is the best time I could get, and I get the feeling I'll be selling those rims soon.