How does Wheel size reduce perfomance
02-25-2007
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more rotational mass, more weight for the tranny to spin. Lighter, smaller wheels spin faster and vise versa for larger wheels.
02-25-2007
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^^exatly
But, were u runnin steelies? then upped to some 17's?? like you can reduce performance like xsr said, but usually aftermarket wheels are wider, thus increasing performance like staying on the road, and such. Also it depends on the weight of your wheels as well.
But, were u runnin steelies? then upped to some 17's?? like you can reduce performance like xsr said, but usually aftermarket wheels are wider, thus increasing performance like staying on the road, and such. Also it depends on the weight of your wheels as well.
02-25-2007
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But, were u runnin steelies? then upped to some 17's?? like you can reduce performance like xsr said, but usually aftermarket wheels are wider, thus increasing performance like staying on the road, and such. Also it depends on the weight of your wheels as well.
But, were u runnin steelies? then upped to some 17's?? like you can reduce performance like xsr said, but usually aftermarket wheels are wider, thus increasing performance like staying on the road, and such. Also it depends on the weight of your wheels as well.
My VP came with the 15 inch Alloy wheels Upgrade (EX ones) 
Something good in a VP 
02-25-2007
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i don't know bout you guys but when i put my 17's(with the tires mounted) up to my stock wheels.......they were exactly the same hight but obv. wider. oh and by the way my konig tuner 2's r way lighter than the stock ****.
02-25-2007
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Rep Power: 788 my new rims are only 13lbs, compared to stock 17lbs. feels like the difference between driving on an empty tank of gas instead of a full tank.
02-25-2007
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Rep Power: 0 someone on a 350z site said for every 2lbs you lose 1hp at the wheels. but i went from 15's to 17's and my 17's are noticably heavier then the stockiers but i see no difference, but since they are wider they get more traction in those turns.
02-26-2007
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Rep Power: 267 i think it's 1lb rotating mass = 10lbs stationary mass. so even if your wheels are 3lbs heavier, that's 12lbs total for the car, so that's like carrying an extra 120lbs. even 1lb heavier would be an extra 40lbs.
02-26-2007
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Rep Power: 245 You also have to realize that it is not just the additional weight, but the location of the weight. The rotational mass issue includes how far the mass is from the center (I believe it is a distance squared issue). Larger rims extend the weight outward from the center which increases the rotational mass. The more rotational mass, the harder it is to turn the wheel, therefore decreasing acceleration. Additional rotational mass also makes it harder to stop the spinning wheel, increasing braking distances.
02-26-2007
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Rep Power: 357 You also have to realize that it is not just the additional weight, but the location of the weight. The rotational mass issue includes how far the mass is from the center (I believe it is a distance squared issue). Larger rims extend the weight outward from the center which increases the rotational mass. The more rotational mass, the harder it is to turn the wheel, therefore decreasing acceleration. Additional rotational mass also makes it harder to stop the spinning wheel, increasing braking distances.
I = Inertia
M= Mass (weight)
r = Radius
just plug in the #'s... the wheel with the Higher I will be the "slower" wheel.
02-26-2007
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Rep Power: 329 ^u guys are a bunch of nerds...hhahha
i volunteered to do this in my physic class...we did it on a stool holding 5lb dumbell weights....
i was totally supprised by the difference
i was totally supprised by the difference
02-27-2007
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Rep Power: 264 An additional aspect which you want to take into consideration is the fact that if you add weight to the rims, it is now more unsprung weight. The engine has to work harder to pull more weight down below. However, I've got 18's and their a little heavier per rim-19lbs per rim. You get used to the difference, and in my opinion, the handling characteristics are worth the weight.
agreed, that and bigger rims look way better
02-27-2007
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Rep Power: 0 Ya you can use inertia and centripital (sp?) force equations if you really wanna know the tiny difference it makes. What effects spin acceleration the most I believe is the circumference, which with 17s and 45 series tires is about the same as the 14 wheel and tire combo that comes on everything but the ex. Plus my 17s are lighter than the steelies, however most of the weight is on the outside of the rim. Overall I don't think the switch made much of a difference. My tires grip way better (I can hardly peel out if they are dry in 1st) and acceleration didn't decrease much if at all. What does it matter any way, the acceleration is pretty weak unless you gots urself a swap or turbo.
02-27-2007
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Rep Power: 266 If the extra weight isn't noticibly negatively affecting your braking, then it's probably not doing much to your acceleration, either. One could argue that the stickier tires will make up for a degradation in brake performance, but the same holds true for acceleration, so the tire argument negates itself. Overall, i'm willing to sacrifice a bit of acceleration to be faster on corners from the shorter, stiffer sidewalls of the tires on my 17s. I do understand that i could accomplish the same thing with 16" wheels with good tires, but the 17s are still way better than the cheap all seasons on my 14" stock wheels.
BTW, thanks for the physics refresher, guys.
BTW, thanks for the physics refresher, guys.
03-01-2007
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Rep Power: 357 Ya you can use inertia and centripital (sp?) force equations if you really wanna know the tiny difference it makes. What effects spin acceleration the most I believe is the circumference, which with 17s and 45 series tires is about the same as the 14 wheel and tire combo that comes on everything but the ex. Plus my 17s are lighter than the steelies, however most of the weight is on the outside of the rim. Overall I don't think the switch made much of a difference. My tires grip way better (I can hardly peel out if they are dry in 1st) and acceleration didn't decrease much if at all. What does it matter any way, the acceleration is pretty weak unless you gots urself a swap or turbo.
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