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Think of trying to run in heavy, muddy army boots or a pair of high tech running shoes. Same difference. The extra unsprung weight of the wheels will change how well the car can accelerate(lighter wheels, driveshaft, flywheel all contribute), turn(try throwing some weight around), brake(extra rotational mass makes more work for the brakes) and will also change the ride characteristics(change in tire size, too thin of a sidewall will directly effect ride and extra unsprung weight effects shock valving setup). Your suspension is fine tuned to the weight of the stock wheel and tire package.
Imagine those boots with mud all over them every step being a little more difficult then they would be if you were in your clean running shoes. Hope that makes some sense to you. The rotoational mass and unsprung weight of your wheels IS IMPORTANT so either stay stock or go lighter for sure.
Don't know about the possible tire sizes that can work for you but those 17's I was talking about come stock with 215/45/17 in the front & 245/40/17 in the back. In my personal opinion stay with the stock wheel/tire combo sizes whether you go 16 or 17 because when you add width to your tires without compensating for wheel width your adding some slop to your suspension and mainly left/right transitional responsiveness. What I mean is when you have the right size wheel & tire combo (Honda has done their homework ) you have a tire that is nice and taught on the rim providing crisp responsive on the limit handling. When you have that extra width on there (even when you compensate a little bit with a shorter sidewall) it's kind of like having baggy pants on your car. Where they're gonna move around more underneath you when you're hustlin' it. Which sucks.
Ever tried doing donuts in a truck with tall sidewalls?(not me of course) well what you'll get is the front tires want to fold over themselves and try and come off the rim (an extreme case of what I'm trying to talk about). The tires will move around and it won't feel good, is my point. The less sidewall flex the better. Which is why big wheels are better but only to the point at which that vehicle is meant to handle & our S2000 is a small car.
I've been asked what size my wheels were a few times just to tell them and have them say "Really!? I thought they were 19s or at least 18's" this because of the size of the car. I agree, the 17's look like 18's would on an Audi, BMW, or even like the 19's do on the G35's it's all in relation to the overall size of the car.
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