Less harsh, more sidewall roll/flex. fatter tire increasing the overall radius, therefore even slower acceleration. Also a bit of a weird fat look.
 
will look daft for a start.

even 195/50/15 look bad.

dont do it.
 
The "50" or "40" refer to the height of the sidewall as a % of the width.

E.g. 205/50/17 would have a sidewall height of 102.5mm
 
070617-4.jpg


thats 205/50/17.

Your OZ's would look cack.
 
Just be grateful your not sat in my detention then because bluntness would earn you more minutes ha ha.

Ok shall have a shop round for some tyres which are no larger then 205/45/17 depth

Shall have to give the Vredestein Sportrac 3's a miss