noise when reversing

[wolf02]

Hi,

I recently replaced my wheels with 19" RS8 Replicas.
Since then ive been getting a really loud squeeking noise when reversing on 1/2 to full lock.

My car has always done it to some extent even on the stock wheels but now its really loud and always does it rather than sometimes.

What could the cause be ? where should I start looking ?

BTW the wheels are not catching the bodywork or inside of the wheel arches etc. Forwards is fine, it only does it in reverse.

Thanks.

[wolf02]

Anyone ???