Originally Posted by mconlonx

I understand the point of 650B wheels when doing a conversion or building a smaller frame. But for average to larger frames that are built for wider 700 tire sizes, like cyclocross or touring bikes, is there any advantage to 650 wheels? At the wider sizes on 700 rims, you'd have more rotating mass, the wheels would be less responsive, but you'd also roll over road imperfections that much easier with albeit marginally more tire in contact with the road. Sounds like a tradeoff, depending on your riding style, but other than personal consideration, is there any advantage to going with a 650 setup on a frame that can already take wider 700 tires? Is the ability to run wider, lower pressure tires the only advantage of 650 wheels?