Re: OK to mix 195/60/R15 and 195/65 R 15 91V tires?

No problem, but I'd put the 65s on the rear because- in a panic stop, you don't want your rear end to slide out. The front end will do fine with the ever so slightly smaller 60s because 1) you have steering control, and 2) ABS brakes. If you don't rotate, the front will need to be replaced while there's still decent tread on rear. At that time, you'll buy new 65s for the rear, and rotate old 65s to front. It's all about maintain best possible control when traction gets iffy.

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