| Its a good way of easily tuning grip levels, some cars (a lot of toyotas) have a narrower track at the rear too.
Narrower tyres on the front give you more steering feedback.
Some cars (especially MR stuff like MR2 or Elise/Exige) handle a lot better with the same tyre type and size all round, and staggering it makes them twitchy(er)
For general stuff I like running the same all round for balance and predictability, although ultimately its down to driver preference and it varies depending on the type of car (light/chassis) what has been done to the suspension and how its been set up etc. |