Bob58

I was having a hard time picturing that but I can see it now... Thnx!

daveak05

Well, I would ask: how is the rolling diameter exactly the same, assuming that you're not dropping way down in profile, say 45 to 30? Which most people with 19" on Audis don't do, Audi included.

Going from 17" to 19", you are adding an inch at the bottom(pavement) and an inch at the top(wheel well).

Going from a 17" wheel to a 19" will affect ride height by one inch at bottom. It's in relation to the hub, which hasn't changed if suspension not lowered. This is assuming you're not dropping down from say a 45 to a 35 or 30 series tire, in which case height increase would be less, if at all.

I think it needs to actually be done and eyeballed on the car, 17 and 19 side by side, as we are all guessing at the perceived visual difference at this point.

D-

daveak05

I don't understand this. 40 is a measurement, even though in relation to total tire from one side of rim to the other(such as the 235 number).

D-

danfrompa

can give you a different look even though they are physically same. The less offset than factory will give you aggressive stands but will also exaggerate the wheel gap as it would clearly show the difference from tire to the fender. If it has the larger offset, the tires would be tucked in under the fender and it will actually hide away a little bit of the wheel gap... Same thing with the tires. The "H" rated common all season tires are more like donut where the edges are round which hides away the wheel gap a little. But, the performance tires ("W" or "Z" rated) would be more rigid and almost flat surface (90 Degree from side to the bottom), which will exaggerate the wheel gap.

Even if you have stock sport suspension, adapting 18's or 19's with performance tires will exaggerate the wheel gap.

Search for the pics!

Bob58

<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&amp;url=%2Ftires%2Ftiretech%2Ftechpage .jsp%3Ftechid%3D7">http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=7</a></li></ul>

daveak05

Seems like we're in another back and forth. Good talking to you again.

Regarding the true technical answer to various wheel/tire setups, and how it affects height and gap, I think we are in need of an engineer here. I know I'm not!

D-

daveak05

And your point is? I think the link you posted confirms my statement that the aspect ratio(or profile) is a measurement of sidewall height in relation to total circumference.

D-

MB The Body

yeah... but this is the productive kind of back and forth

daveak05

It is, but the poor guy who originally asked the question hardly has his answer...

MB The Body

it comes down to personal preference and what you like when you look at a car