I understand the concerns. I wanted to use 28mm tires with fenders. I just dont want to be hitting the ground with either the pedals( I use 170mm crankarms) or the bottome bracket which I dont think I will do. I do not have an old beater with 26*1.28 wheelset however I am going to try the frame with 700c wheels from another bike I have and than see about changing over to 650b. In regards to the link from photogravity I think the 650b tire and wheel world have more products available to it today than it did in 2008. I use to fool around with triathalons back in 1989 and I seen to remember 650 wheels. I do not know if they are still around however it was the up and coming think,