Shopping for used car- are "mixed" tires dangerous?

[davec]

C-ris- thanks for your post. The last car we did test drive was in very good condition. I'm guessing the previous owner did not rotate the tires as often as they should and, when the front tires wore out first, just replaced the 2 tires. All four tires are in excellent shape, but each pair is a different brand (Continental, Michelin). I'm guessing price dictated which brand they purchased.

Thanks!
Dave