"Ronny" > wrote in message
...
>
> 16" wheels on the Audi may have a "J" of say 7 or
> 7.5 it all depends on the width of the wheel itself,


Standard A4 rims are 7.5"@16", 8"@17", and 8.5"@18".


> I would say 225's will go on a 16" rim, but its
> impossible to tell.


If the rims are 7.5" wide, the fit is marginal for
225 tyres, and the combination is definitely not
recommended. If you want 225/50 tyres, you should
put them on rims that are at least 8" wide.


> if the wheel is too narrow ie 6.5/7J what happens
> is the sidewall of tyre hangs over the edge of the
> rim a bit like a tyre which has sidewall protectors.


Bingo!

That would require the tyres to be overinflated
just to prevent them from galling off the rims.



dk