Ok, I've used Conti Fire XC Pro 2.1's, Conti 2.3(skinny for 2.3),Kenda Nevegal 2.3 DTC (Tractor tires!),Kenda 2.1 Nevegal DTC and WTB Mutorapter 2.4's.
Finally settled on the WTB mutos cause they are lighter than the other 2.1's, roll pretty fast, turn good and have the high volume casing.
Tom, just got the Ellsworth Epi yesterday ( was a Demo bike), it has the 2.3 Kenda Nevagals... he like I, was NOT impressed with the rolling speeds of ( the effort it takes to go fast on streights)
So, what do you use? To meet the requirements listed for the subject of this thread?