I posted this thread in the wheels forun but looks that everybody there are fancying with their chrome wheels~

Please help me...
Hi, I recently got some new 16x7 Enkei's for my 2000 EK4....
I really love them, but I've got a problem....
the problem:
my cousin gave me some unusing tires, so I made 205/45/16 for the front and 205/50/16 for the rear... Front ones are brand new and rears used but still in very GOOD condition...
From the moment I changed my wheels I get a f**king noise (like humming) at 45~70 mph... I think its constant, but it gets to the "top" at that speed range...
It's a "uuuuuuuuuuuuuuuuuuu~~~~~~~", like some damaged bearing or something...
- Does anybody suffer (or suffered) the same problem???
- Are the tires too "big"??? Should I go 205/40/16 on all 4???
- the tires are Sumitomo HTRII
- what brand would you recommend??? I want it to be SMOOTH AND QUIET!!!!
The original wheel & tire sizes are: 15" with 195/50...