18" alloys on my A3?

A3Bash

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I've just got hold of my latest car, 55 plate sportback. Just want to know if I got some 18 inch alloys, genuine audi's, would it slow the car down? It has no mods at the moment so would I also need to lower it once the alloys were on? Hoping to put some pics up once I get some changes done. Thanks
 
Mine came standard with the 18"....of course, I'm in the US but.....heh... doesn't slow her down a bit...FL Highway Patrol love me......:)
 
What makes you think it would slow it down?

Whatever size of wheel you fit, the total diameter of the wheel and tyre together stays the same. If you fit bigger wheels, you fit correspondingly shallower tyres...

Any you don't have to lower the suspension just because you've fitted bigger wheels - its a completely separate thing.
You can lower it with the same wheels if you want....

People lower the suspension to simply make the car look better. When they do, they usually fit stiffer springs, because you need more resistance if you haven't got as much suspension travel - but that does lead to a harder ride...

Sport and S-Line models got lower suspension as standard fit....