EEK, this is a controversal subject. I personally believe that the best tire should be in the rear because it's easier thus faster to change a flat in the front. BUT and I mean a BIG BUT; most if not all bicycle mechanics and professionals say the best tire should be on the front because in case of a blow out it is easier to control a bike with a rear blowout. This has not been my experience in over 35 years of riding though! First off a sudden blow out is rare, thus most flats are slow leaks that allows you plenty of warning and time to slow down. Second, I have had a blow out both in front and rear and my experience was bad when when the rear went because the bike slid out from under me whereas the front did not do anything unusual. But please note, my recommendation is based on my experiences and I am not a pro, so you may want to base it on what the pros do. Hmm now what do you do? What has been your experiences or those you know?