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Im gonna get 18's, they are coming this week?
Will they really slow me down? like a lot? i know our cars arent that fast, but id ont want it to be slower either

 
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Most 18's are quite heavy. Even you get lightweight 18's, the additional rolling resistance due to the width/surface area will probably hurt your performance a little. I've got 18x7" Centerline RPM's that only weight 14.5lbs each with 215/40/18 Yokohama Parada's. I'd say that it might have slowed me down a wee bit but not enough to be disappointed. Heckuva lot better grip and an overall more solid feel to the car. Of course I also have a ton of suspension improvements.

 
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Does it really matter? Unless going fast is really important to you, then you probable wont notice much. and if it is, then get a smaller size tire on your 15's as in shorter, not narower. (helps with acceleration.)
Also, slow as in how? acceleration? corners? I ask because Low profile tires are bad at drag racing, the side walls are to stiff. where in corners its a bonus to have stiff side walls.

 
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get em ive had em all 14,15, 16, 17, 18, 19 and 18's arent that bad just get 215/35/18 or else you'll feel like your going slower(speedo is off alot) and you'll be fine with all the extra traction you'll be glad their a lil heaviery and if you go with 17's you'll be mad you didnt go bigger. i finally ended up with 17's because i really liked the size and i have a lil thicker tire than i did with my 215-35-18. or if you have 18x7.5 go with 225/35/18 those r really nice. or even 215/40/18 if you have alot of shi%%t roads there

riley

 
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I want 17's. What's a good weight that will keep performance and MPG the same or possibly better? When I say performance I mean acceleration.

 
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Also I have an ex and wanted to get 205/45/17

 

I'm also looking to get 17's, how do these size rims affect my overall performance? I'm more concerned with speeding, more of the 1/4 mile type speed? Will these really slow me down? Another question is what are are the best tires to get for these rims?

 

Another thing is, as everyone can see, I'm from Brooklyn, New York, and I don't think u can find shittier roads anywhere else. Are 17's the best size to go with since the roads here are bad? Cause I don't think bigger rims are a good idea.

 
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We need to find the weight of the stock wheel/tire. If your new wheel/tire combo weighs more, then you will go slower, if it weighs less then you will go faster, of course this is assuming that you kept the same overall diamiter. if you go to a larger diamiter (your speedomiter will read a lower MPH then actual.) then you will accelerate slower, but you will have a Higher Top speed, if you go with a smaller diamiter, then you will accelerate quicker, but you will have a lower top speed (and your speedo will read a Higher MPH then actual).

 
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Any wheel that's lighter than stock. A stock EX rim without tires is 18lbs. A heavy tire might make up for the weight loss in most cases thus you will feel a loss in performance in acceleration, but not much to complain about providing the wheels were forged.

 
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It depends on the wheel. If you get a traditional caster made rim, it'll be heavy. If it's forged, it can be as light or lighter than most 15s. The biggest benefit to bigger wheels in terms of performance is a bigger width and you can run larger brakes.

If you want to talk tires, you need to search. Asking which tire you should put on your rim is almost like asking what rim should you put on your car.

 
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17s are probably the largest (and near the bottom of the choices) you want to go if you're concerned about comfort. Road noise and comfort depend on two things... first and foremost, tire SIZE and the type of tire it is. An all-season tire would be quieter than a lot of performance tires. A good size to look into is 215-45 for a 17 to maintain a good look w/ good performance without putting a beefy tire on a wheel that stands out. A good place to research tires (or even purchase them) is tirerack.com

 
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w/ my 15's i ran a 15.8 and with my 18's i ran a 16.5 .. there is a big difference

 
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Because it takes more energy to rotate a wheel. In caster made wheels, most of the wheel's weight comes from the center hub. This is of course where the car uses it's energy to rotate the wheel and that's a definite disadvantage. However, with forged wheels, most of the weight is placed on the outside of the wheel (the area that the tire is mounted over). Therefore this makes the wheel easier to turn with the help of the lightened forged pieces.

Most people who race Hondas wouldn't go with anything over 16 because 16 is a compromise between looks and performance sacrificing some acceleration. 17s, only if they are forged as they become the next compromise option. The good thing is you can run larger brakes. The downside is, forged rims are expensive as hell, and there are a lot less good tire selections for a 17 inch wheel compared to a 15 inch wheel.

If you want to go with 18s, and you're worried about performance, I would say try to get something lightweight like SubZeros or something. You'll still go slower, but it won't be as bad if the rims are light.

 
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that was a big help!!

 
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Some people may argue that 17s are good for track or autocross events over 15s. This is a misanalysis. Everybody will agree that their 17 inch wheels handle better than their stock 15 inch wheels. This is true because the stock wheel is 15x6 (or 15x6.5), but most 17s are 17x7. In other words, the reason the 17s handle better is the width of the wheel over a stock 15.

Now if you have a 15x7 or a 17x7, the 15 would be better because it's lighter and shares the exact same width of the 17 meaning it can handle just as good as the 17.

Just a bit more info to boost.

 
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Lower profile tires have better turning reaction. just width ain't good enough.

Anyone know how much 2k2 SI wheels weigh?

 
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I think EX and SI rims are just the same....I could be wrong though..

 
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HAHAHA! Wrong. The wider the wheel, the wider the tire which overall = more stability, more traction, more steering feel. A lower profile tire does less than what a wider tire can do in those aspects.

That's like saying if someone put 40 series profile tires on my stock 15X6 with 185 as the width, it'll outhandle the the same car with 15x7 wheels with 225 as tire width, and 55 as the profile.

Never on a cold day in hell.

 
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Actually the lower profile tire will have a Harder Side wall, thus reduce tire diflection. A Tall side wall is a weak side wall, unless you are useing a tire designed for cornering, such as the Falken Azenis sports, or other such race tire. Grassroots motor sports did a study on this subect, and using the same tire, just different sizes, ranging from 14-17 they found that the larger wheel 17 preformed SIGNIFICANTLY better in the corners then the 14. 32.675 sec for the best run with the 14's and 30.592 sec for the 17's thats a little more then 2 sec difference. http://www.grmotorsports.com/plustest.html

 
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I'm not surprised but it is a post.

 
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The width of the wheel will determine how wide a tire you can run, so yes its better to have a wide wheel. That way you can run as wide a tire as you can fit in the wheel well. Road racers, use small sized wheels such as 13X7 and then put on as wide of a tire as they can fit, like a 225/45ZR13 Hoosier R3S03, that way they can have the lightness of a small wheel, and still have the rigidity of a lower profile tire. Along with the acceleration advantages that a smaller "total" diameter wheel will give.
You don’t see this on street tires, because of safety issues. With a small low profile tire, you have a very low volume of air held in that tire. The less air in a tire (volume of air) the less weight the tire can safely hold up. On a racecar this is not really an issue, as you know the total weight of the car and can adjust things accordingly. On a Street car where the amount of weight is a Variable, this lowered weight bearing ability can be a significant safety issue.


I autocross, so all this Wheel/tire/handling stuff is something that I did a lot of reasearch on before i made my decision to go with a 15X6.5 (Rota Slipstreams) wheel with a 205/50R15 tire (Falken Azenis). its a small enough total diameter vs stock to give me a boost in acceleration (Kills top speed). and with the tires being as sticky as they are and with the reinforced side walls this set up is much faster.

 
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the weight of rotor plays a role in this as well. probably can get lighter rotors to reduce the overall weight by 1lb or 2.

 
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That too, you want as low of a unsprung weight as possible. that includes Control arms, axels, basically any thing not held up by the springs. The lighter your unsprung weight, the better the suspension will be able to do its job.

 
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people exagerate the power loss that u get from 18s. I just put mine on 2 days ago and i am pleasantly surprised. Trust me in every day driving you wont notice much of a difference. Unless you are always slamming on the peddle trying to get to 60 as fast as u can, u wont notice much of a difference. Also people really exagerate the bumps you feel from 18's... I got 215/40 tires and they are really comfortable, again you slightly feel it but its no big deal and definately should not be a deterent. Ofcourse the ride will get rougher when i lower it. But I am extremely glad that i got 18s and nothing less...

 
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I agree, but when you are really in to racing every .001 th of a second counts. Thats why I have 2 sets of wheels/tires one for the street 17X7 and one set for racing 15X6.5.

 
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quick question, someone said that 18's will throw off the speedometer, how much will it throw it off if i got 215/40/18?

 
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as far as I remember, when I had put my rims with 215/40/18 beside my stock wheels, they were almost the same height. So they wouldnt really throw off the speedometer. Ive had them on for about a week now and havent noticed any difference. And if there is a difference than it is negligible

 
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Si wheels weigh 18.5 lbs. Got some on my '03, im glad too, so much better than the hubs

 
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At Least They Will look good on your car.