BIGGER WHEELS = SLOWER CAR???, can you say INERTIA??? Options

[97GTinKC]

QUOTE

what are you talking about.. drilled rotors are for heat dissipation.

maybe now it is, 25 years ago we were drilling them for less weight, on bikes mostly...dont remember anyone doing it for better heat dissipation, not sure anyone had realized that aspect of it yet. even had a few guy want me to cut their new rotors down to the minimum thickness to save a few extra ounces. (Kinda thought that was going a little too far myself)

[Guest_Matthew_*]

think of it as a 21 speed mountain bike

first gear= really easy to get going but no top speed that is good
21st gear= really hard to get going but once you do, LOOK OUT!!!

that's my tech for the day.. i'm to the bar.

[nik]

THE WHOLE REASON FOR BIGGER RIMS IS SO THAT YOU CAN CLEAR BIGGER BREAKS SO YOU CAN STOP FASTER BUT ALONG WITH THIS YOU NEED A ENGINE THAT COMES WITH HIGH HP/ TQ I HAVE 18 AND THEY ARE HEAVIER THAN MY 15'S I COULD SPIN THE CRAP OUT OF THE 15'S NOT THE 18'S WITH 2153518 FALKENS ON THEM IT STICKS TO THE ROAD LIKE GUM

[Zoom]

There's no need for the all caps man, just a thought

Anyway, as much as you all are enjoying this tech discussion , let's not forget some people put new wheels and tires on their car simply for a different, unique look.

[airj0hn]

Do most wheel websites show the weight of the wheel? I haven't been able to find that information. I'd like to get some bigger wheels (got little 14" ones now) but I don't want to sacrifice any speed on my powerful ST.

[hi_rider]

on www.1010tires.com, you get the weight of wheels you buy.
Just make a few searchs, you'll find sites with wheels wheigt.

[94Toy]

So from what I've read on all this wheel talk, I would be on the safe side to just get 16's right? I want wheels for a new look, but I am more for speed than a look. Also isn't there something about the less hp you have the skinnier you want the wheel? Like 6.5 would be good for our cars?
By the way whats the wight of the stock wheels on the Celicas?

This post has been edited by 94Toy: Apr 24, 2003 - 11:41 PM

[hi_rider]

If you want speed, go with Super lightweight wheels such as ssr competition, OZ superleggeras ,rota ...and others, in 15 inchs...mouhahahaha, you'll gain performance over your stock wheels. I think our stock 15 wheels weight around 15 lbs, not sure. Many 17 weight 23 lbs. Superleggeras in 15 weight around 10 lbs...
As I said, when I put my 23 lbs 17s on my gti, I lost around 4 cars length on a 0-160. And this with 180hp-180lbs/in.

http://www.seanet.com/~jgtang/wheel.txt

http://www.jimsnodgrass.com/wheels[1].html

This post has been edited by hi_rider: Apr 25, 2003 - 5:27 AM

[97GTinKC]

I think the stock 15x7 GT wheel is closer to 18 lbs., I sold a set recently and seem to remember 18. I am getting ready to swap a couple of tires around, will post the weight of the stock wheel then.
On my wife's digital bathroom scale, the stock 15x7 wheel with worn Michelin Pilot 205-55-15 is 34.2 lbs. while one with most of its tread left (had one tire replaced) comes in at 36.0 lbs. so wear can change things by a couple of pounds also.
Michelin doesnt list weight on their web site, but Continental does, their Extreme Contact 205-55-15 is 21 lbs. while a 215-40-17 is 20.9 lbs. and the Conti Sport Contact in 225-45-zr16 is 18.9 lbs. while the 265-35zr18 (which is 24.3" tall) is 23.7 lbs. (all tires have the same approx diameter 23.9 for the 1st 3 and 24.3" on the 18), so weight can vary between models and same approx. sizes even in the same brand.
36 lbs is probably a good baseline to start from. If a person stays in the same height range as stock(23.9" diameter) , and the same approx stock weight (36 lbs wheel and tire combo) they could run 17 or 18 inch and probably not lose any performance. As far as the weight being concentrated farther out from the center affecting anything, I think it would be too hard to calculate. does it really make a difference accelerating 2 differently shaped masses of the same overall diameter and weight? I agree if you go taller, you will take a performance hit, (even 1 inch will make a noticeable difference and affect the speedo)
And remember wear can account for a few pounds of rubber, so a few pounds either way probably wont make a noticeable difference.

[pflau]

hey the stock GT 15x7 wheel is about 16lb each. I just weighted it

[KAMiX]

Is the weight of the wheels really going to make such a big difference? we are talking less than the weight of 1 person here

when i get my 17/18s ill just ride wif less ppl in the car


I would have thought the extra rubber would make more diff than the extra weight.

[hi_rider]

That's what I was thinking before, but now I've seen the difference, I can tell you there's a difference.
With 23 lbs 17s, I saw a big difference
With 16lbs 17s, I didn't saw any !

The thing is that this is not static weight, it is weight that have to get in rotation to get the car to move. I've already read somewhere , i don't remember the numbers exactly, but i think 10 lbs more on your wheels equals to 40 lbs of static weight in your car. It may not be the right numbers, but it show the ways it works.....ok, it is not that a big diff, but when you race, it is a big diff....

[KAMiX]

Yeah I got ya man.

Not going to stop me though our cars look too weak with small wheels!

[Rivo]

It's that age old concept of rotating mass The lighter the parts that are moving, the easier it is for them to rotate, the less work to get them moving, all equals more power output in the same amount of rotations

[Supersprynt]

WHen i put my 17's on, compared to stock you can definately feel that its easier to maneuver, and you'll slow ur acceleration down with heavier wheels, but other than that it wont make soo much difference. Its liek a flywheel - heavier it is, the less power reaches the wheels.

WOO HOO 300!

This post has been edited by Supersprynt: May 2, 2003 - 12:40 PM

[94Toy]

Okay I was just wondering, does the weight of the tire play into this at all I havn't heard any talk of this but I was wondering because I am getting 16's that weight 18 pounds a piece and for every inch you go up on a wheel the tire surface gets smaller and smaller so could a 16 inch 18 pound wheel with a low pro tire weight the same or mabey even less than the stock 15's with a normal radial tire? It seems like this would make sense to me. So can somebody please explain this to me, besides a lot of drag cars that run with street tires run with 16's or 17's.

[KAMiX]

I really don't know what the difference is with normal street tires, but I know it affects the lap times for f1's

[maikl]

i know that bigger rims will make the car slower but in my case i would like to know your thinkings..... i have now 205/55/r15 rims and i got now new 17s with the 215/40/zr17 falken tyre and lets say tha my car now makes the 400m in i dont know 13,5s after i change the rims how much time will i lose?

This post has been edited by maikl: May 3, 2003 - 8:31 AM

[97GTinKC]

QUOTE

know that bigger rims will make the car slower but in my case i would like to know your thinkings..... i have now 205/55/r15 rims and i got now new 17s with the 215/40/zr17 falken tyre and lets say tha my car now makes the 400m in i dont know 13,5s after i change the rims how much time will i lose?

Probably none, as those 2 tires are the same height, you may even gain a little, if the tire/wheel combo weighs less than the old ones. should handle better with the lower profile tire. if you have a scale could you weight both and let us know? also which 17" wheel you have?

[maikl]

i just got the mim rims they are from italy and they are weight less than my stosk ones that is for sure