i have a 99 si with the stock rims i want some rims with more traction and more looks. So natrally i go out and find some. Some roja 18 inch rims they are 428 dollars a peice and weigh 15 pounds. would this help my traction in launching my car or no not really i would go 17s but the are 380 and wtf might as well pay the extra 50 for 18s. they are roja8 i think they look like a bigger version of the si rim which i like. what do you think. will this help my traction and 1/4 time any.
no...it will hurt your acceleration....Bigger wheels with the same weight will still have a larger moment of inertia....keep the Si wheels and get some good tires like some Potenza SO-3s...if you need traction at the track, just lower the tire pressure. The SO-3s are fuckin dope....keep in mind the tire weight often has more to do with decreased acceleration than does the wheel weight. If you decide to get new wheels, I wouldn't go more than 16" if your concerned with performance and or daily drivability.
If the weight of the wheel is less than your stock rims, then it would be better. Usually a 16" or 17" is good enough though because the oversized 18" doesn't have enough good quality tires to make it perform well unless you have enormous wheel space under your fenders (like rear wheel drive cars).
If you have less wheel weight, it will be easier for your car to spin your wheels so you will go faster. No addition of HP, but easier to spin the tires because it weights less.
Take for example a solid steel pipe and a hollow plastic PVC pipe. Try spinning the solid steel pipe around in circles. Not too easy huh? Now spin the hollow plastic PVC is easier to spin because its lighter and it takes less energy. Get the idea?
Originally posted by sak If the weight of the wheel is less than your stock rims, then it would be better. Usually a 16" or 17" is good enough though because the oversized 18" doesn't have enough good quality tires to make it perform well unless you have enormous wheel space under your fenders (like rear wheel drive cars).
If you have less wheel weight, it will be easier for your car to spin your wheels so you will go faster. No addition of HP, but easier to spin the tires because it weights less.
Take for example a solid steel pipe and a hollow plastic PVC pipe. Try spinning the solid steel pipe around in circles. Not too easy huh? Now spin the hollow plastic PVC is easier to spin because its lighter and it takes less energy. Get the idea?
lolz you couldnt be more wrong first of all, the biger the rims, the better the tire i dont think theres any 15in tire that can go past 150mph and just because a rims is biger but lighter doesnt mean that youll get better acceleration its not easier to spin the tire as you put it like some one said before, theres this thing call inertia, biger rims = biger rotating mass = slower acceleration
take for example a pipe 10ins long and a pipe 20ins long try to spin the pipe around in circles the shorter pipe will spin faster with less effort get the idea?
Originally posted by LAblue lolz you couldnt be more wrong first of all, the biger the rims, the better the tire ...
You are right to a point. How many tires out there do you see that are of good quality and have more than a 35 series on an 18" rim? I thought so! Good 18" tires usually come in sizes that only fit rear wheel drive cars.
With that low of a profile you will probably have to worry more about bending your rims when taking a fast corner rather than just go fast.
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Originally posted by LAblue ... i dont think theres any 15in tire that can go past 150mph ...
The mximun speed of a tire depends on its rating, not the size of the wheel that it mounts on. If it has a Z or W rating then it can well surpass that 150mph mark.
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Originally posted by LAblue ...and just because a rims is biger but lighter doesnt mean that youll get better acceleration its not easier to spin the tire as you put it like some one said before, theres this thing call inertia, biger rims = biger rotating mass = slower acceleration
take for example a pipe 10ins long and a pipe 20ins long try to spin the pipe around in circles the shorter pipe will spin faster with less effort get the idea?
Yes, but if bigger but lighter, it will spin faster. If you spin a 10' pipe that weights 5lbs vs a 20' pipe that only weights 5lbs, of course the 20' pipe will be easier to spin.
You are right to a point. How many tires out there do you see that are of good quality and have more than a 35 series on an 18" rim? I thought so! Good 18" tires usually come in sizes that only fit rear wheel drive cars.
With that low of a profile you will probably have to worry more about bending your rims when taking a fast corner rather than just go fast.
The mximun speed of a tire depends on its rating, not the size of the wheel that it mounts on. If it has a Z or W rating then it can well surpass that 150mph mark.
Yes, but if bigger but lighter, it will spin faster. If you spin a 10' pipe that weights 5lbs vs a 20' pipe that only weights 5lbs, of course the 20' pipe will be easier to spin.
and how many 15ins tire with z rating does you know?
ps: actually if you spin a 10in pipe that weights 5lbs and a 20 pipe that only weights 5lbs, the 10' pipe will be easier to spin.
I just got some 205/50/15s Z rated Nangkangs $55x4=cheap 15in tires on stock si wheels....any way. They have a group buy for Konig Green Lights and Heliums for 385 for a set.....cheap lightweight wheels for sheezy!!!!!!!!!!!! now deal.....
Again, please read carefully at what is being compared!
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Originally posted by LAblue
and how many 15ins tire with z rating does you know?
ps: actually if you spin a 10in pipe that weights 5lbs and a 20 pipe that only weights 5lbs, the 10' pipe will be easier to spin.
I have a feeling that we are both not talking about the same thing here. I agree with your comparison, but you obviously don't see what i'm comparing here.
You are right here about being able to spin the 10" pipe easier than the 20" pipe if they weight the same. But I am not comparing the same weight here. I'm comparing a lighter and larger vs heavier and smaller wheel.
Some 150mph & over 15" rated tires:
BFGoodrich g-Force T/A KD
BFGoodrich Comp T/A ZR
Bridgestone Potenza S-03 Pole Position
Bridgestone Potenza RE010
Bridgestone Potenza RE730
Dunlop SP Sport 9000
Dunlop SP Sport 8000
Dunlop SP Sport D8050 H1
Dunlop SP Sport 5000 Asymmetrical
Kumho ECSTA Supra 712
Pirelli P7000
Sumitomo
HTR Z
Yokohama A022H1
These are just some of the W, Y, & Z rated 205/50/15 tires that I found on www.tirerack.com
What makes you think a 15" tire can't go up to those speeds? FYI, the 90-93 NSX came with 205/50/15" tires on the front and the NSX was topped out at over 160mph.
I put 17 TSW's wrapped in toyo proxys on my ride, and I have so say WHAT A MISTAKE! those wheels are heavy but they looked cool. I might have a buyer tonite (fingers crossed). I dont want to put the stock wheels back on so I'm gonna look for some wider 15's or maybe 16's I'm gonna miss the TOYO traction for now.
Since we're on the topic of tires, Madtownhonda, what would be a good replacement for the stock SHITLINS? Good wet/dry performance. I had narrowed it down to Potenza RE730s, Dunlop Sport SP5000s Falken AZENIS, heard really good things about them, and they are fairly cheap and Toyo Proxes T1s, lookin nice too.
Originally posted by MR2KSi Since we're on the topic of tires, Madtownhonda, what would be a good replacement for the stock SHITLINS? Good wet/dry performance. I had narrowed it down to Potenza RE730s, Dunlop Sport SP5000s Falken AZENIS, heard really good things about them, and they are fairly cheap and Toyo Proxes T1s, lookin nice too.
The Dunlops are a good all season performance tire (they are good in wet, dry, and snow). I've heard the RE730s are loud but are an excellent choice. They fall in the same Ultra high performance as the kumhos and I'm sure the Azenis are in the same group as well. The Potenza tires seem to be the best line of performance tires. The SO-3s are probably the best maximum performance tire out there, and thus they carry a hefty price tag. I would try to stay away from Toyo tires myself. I would probably lean towards the potenza, then the Falkens next.
Yes I know that the wheel/tire size plays a big roll too. Usually the smaller the total diamer is better for acceleration and the bigger the wheel/tire is worse.
Just put some big foot wheel/tire on your car and it will crawl all over the place. Of course that is a little extreme, but you get the idea. Too small or too big usually hurts though. Plus it throws your speedo of by a whole lot.
Thanks for the info Madtown. I heard the Toyo Proxes T1s perform very well in the wet. They put some T1s with SSR Comptetion rims on their project EG Civic in SCC magazine. They are purdy....
first of all, the biger the rims, the better the tire 
Z tires and light wheels
OH!!!!
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