hey i got a 95 prelude vtec and i want to replace the rims for something Lighter


but I got afew quesitons

whats the weight on the stock rims now?
Mine are 15's, so would a 15" rota slipstream Fit my tires, or would i need new ones???

 

yup the slipstreams would fit fine..

The stock wheels are like 17 lbs, and the slips are around what, just under 12 or so?

pretty decent savings.. 20+ lbs of weight loss, rotational AND unsprung weight at that..

 

so good idea, or would it be better to get a cf hood OR trunk

 

Removing mass from any rotating, or 'unsuspended' part is going to improve the accelerating and handling characterisitcs of your car better than removing mass from non-rotating or suspended parts. That is a long, and hopefully understandable sentance.

 

so what if you go from 16'' to 17'' and the 17's are lighter, what would be the result performance wise?

 

it depends on a lot of factors, like how much lighter the 17's are, and what kind of tires you're putting on, etc.

from a purely acceleration/braking perspective with equal weights, the 16's will always outperform. the equation used in this would be something akin to:

mr^2 = M(r+.5)^2, where m = mass (16") M = mass (17"), r = radius (in this case, 8" for the 16" wheel). this is not a totally accurate equation, but will give you an idea of how much lighter a 17" wheel needs to be. working this out with all variables gives us:

M = mr^2/(r+.5^2)

plugging in some numbers:

M = m x (64)/(8.5)^2, M = .88m, meaning to have the same moment of inertia the 17" wheel must weigh .88 times the weight of the 16" wheel.

isn't physics fun?!

 

ok so

would it be better to do 15" rota slipstreams/c8's OR 16" rota slipstreams/C8's

PERFORMANCE wise?

 

15's most definitely

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DarkspeedVtec95 &raquo;</TD></TR><TR><TD CLASS="quote">ok so

would it be better to do 15" rota slipstreams/c8's OR 16" rota slipstreams/C8's

PERFORMANCE wise?</TD></TR></TABLE>

any performance related wheel question is dependent on more than diameter. For instance, is the smaller size harder to find good tires for? is the bigger size too narrow for your desired tire width? can you find the tread width you want in the right aspect ratio to match your OE OD? etc etc.

in short, 15's are better than 16's since they are both lighter, smaller, and have more tire choices.

 

Wow, the laws of physics can be actually used to answer real world questions? edumacation