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I'm advised by Goodyear Technical, VWRacing, and my VW dealer, to put the best tyres on the rear on the Mk5 GTI.
When the fronts wear down to 2mm, I move the rears to the front axle and new treads on the rear. I buy one pair of tyres at a time.
Although I've never got new treads on the front, my Quaife diff coupled with my style of driving don't result in understeer or much wheelspin.