There's a lot of conflicting threads and posts on here with regards to the subject of tyres and in particular mixing them on the car, so I've been asked to write this which should hopefully clear a few things up as well as giving you something to think about and make your own mind up on.     I'll start with the very obvious: Tyres are the only thing keeping the car in contact with the road. As daft as it sounds it's always worth remembering, as whether you're chasing tenths of seconds on trac