Volvo Repair: Replacement Tires, yokohama tires, michelin tires

Question
I've got a 1990 745 GL that has Michelin 185/65R15 tires that need replacing.  My mechanic has a set of alloy wheels with new 195/70R15 Yokohama tires, and will give them to me at a great price.  My question is what is the difference in the size and the handling?  I really like how the Michelin tires handle at higher speeds and overall.

Answer
Debbie, are you sure its 70/15 and not 60/15?  Ive never seen a 70/15 tire.  Yokohama is a good tire.  Michelins are by far the worse tires that are made.  They used to be a great tire but now are just expensive junk that doesnt last 20 thousand miles.  Your car will be fine with those.  I just need to clarify the size.  Roger