could not get it to stop. My LBS fixed it by setting toe-in the right way.
My Nano is now rolling on Primo Comets (20x1.5) and what a difference they make. I can coast a lot farther than on Kenda's and acceleration is better, too. Other recent upgrades include orange Gates pedals from Fyxation, Nitto stem, Origin8 levers, Axiom Adjustable Journey rack, rim tape and schrader tubes.