Rotating tires without knowing their previous position on car

[CoryM]

In terms of wear, put the tires with the best shoulders to the front. The front tires wear more because they do the steering etc.

Note that it is typically considered safest to have the grippier tires on the rear as it is less likely to cause oversteer. I personally do not agree with this as I would rather be able to brake/steer and deal with a little oversteer, but stats have shown that understeer is safer for most drivers.