If you will be running 195mm wide tires, the 6" wide wheels should be sufficient. Another half-inch just adds weight and possible fitment issues.
Unfortunately, I have noticed that many newer wheels' smallest sizes are 15 X 6.5" wide, so you may not be able to get the optimal wheel width.
If you run 205s or 215s then the 6.5" wide wheels would be a good fit.
Just my opinion. Consult the various manufacturers' recommendations for matching tire and wheel widths. Also, there may be a formula somewhere to use, but I've never seen one.
Karl
'93GL "Prettystiva" ticking B3 and 5 speed, backup DD; full swaps in spring!
'91L "AquaMutt" my '91L; B6 swap/5 speed & Aspire brakes, DD/work car
'92L "Twinstiva" 5sp, salvage titled, waiting for repairs...
'93GL "Luxstiva," '94 B6 engine & ATX; needs overhauled
'89L "Muttstiva," now a storage bin, future trailer project
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