[recycledsixtie]

or not? My 2001 Boxster base has Pirelli tires - I think all season. The rear have about 10-15% wear left and the front have have about 30% left. I want to get Michelin Pilot summer tires put on the back but is it okay to put them on the back only? I don't race but just use for street use only. Or should I wait till the rear have no tread left and and change all 4? Thanx in advance!