The other thing you need to consider is that as you increase the O/all diameter of your wheels (tyres + rims) and apart from any effect this might have on your speedo's speed indications, is that it will also raise the cars height off the ground. It sounds as though you want to do this to improve the looks of your car, but then it could turn out looking more like an off-roader, which means then having to lower the suspension to make it right.
So you need to look through some of the build threads/gallery before committing to buying rims etc. so you know what you're getting in to.
keep in mind that the road rules say that u can only go over the standard size by 2 inch, if u want more comfort, less noise and what not i would suguest that you go with 17"s so u can have a bit of tyre there for the comfort, factory euro 16s are 205 55 16? if u go 17inch rims u would run 225/45/17 this would be closest u can get to the factory diameter so ur speedo will only show that u are going a bit slower, eg if ur doing 100kmph ur really do 100.4kmph, comfort wise itll be better then 18's. as for the tyre the dunlop direzza arent to badly priced on 225/45/17 a mate of mine paid 170 a corner. hope this helps u at all
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