tyre size for mk6 on 20s

[dubber36]

off set 45  im running 20s on my rs4 with no problems and on many other cars i have owned

Got any pics of it?

[alan desmond]

go flicka put golf gti on air  and there is 1 the same with audi s8 wheels a grey 1

[Exonian]

off set 45  im running 20s on my rs4 with no problems and on many other cars i have owned

What width of wheel is it though? The width and offset will have more of an effect than the actual diameter of the wheel on whether it will fit under the arches at the front.
I ran 8J X 19"  ET44 BBS CK's with 235 35 19 tyres with no issues at all BUT mine wasn't lowered.

[dubber36]

go flicka put golf gti on air  and there is 1 the same with audi s8 wheels a grey 1

I meant pictures of your RS4 on 20's.

[Ess_Three]

off set 45  im running 20s on my rs4 with no problems and on many other cars i have owned

What width of wheel is it though? The width and offset will have more of an effect than the actual diameter of the wheel on whether it will fit under the arches at the front.
I ran 8J X 19"  ET44 BBS CK's with 235 35 19 tyres with no issues at all BUT mine wasn't lowered.

From the OP's other post "hi i wont to lower my car so arches are at top of wheel"...so it appears it's going to be 'humped'.
It'll drive really well 

[Booth11]

Each to their own, but you must be seriously compromising the ride and handling for the sake of 'aesthetics' (and in the context of this thread, I use that word loosely) 

[RickS]

hi just brought some 20 inch wheels for my car and are not sure on Tyre  size do i go,. 235 30 20 or 225 30 20 i am going to lower car on   h and r s any help much appreciated

Sorry, but you can go too far with wheel diameters; I know it's partly a question of taste, but 20" is too big for a Golf and they will make it look silly imo.
If you must go ahead with ruining your cars look and handling don't forget to tell your insurance company.