have just recieved 2 new michelin pe2s . my car (172 cup) currently has 4 original contisport contacts and requires 1 rear to be replaced. i ordered 2 new ones as wanted to keep same type to each axle.just wondered about opinions on whether to put new pe2s on rear or swap 1 good conti from front to back and put new ones on front. any advice would be much appreciated.