I looked long and hard for a sturdy + grippy folding pedal. After some trial and error I gave up and bought the quick release MKS Promenade/Grip King pedals mentioned by the previous poster. Huge platform, good clearance, but one big disappointment -- with some shoes they were slippery when wet. BUT when modified with track shoe type pins they are fantastic. Carrying them separately is a small hassle but on the other hand the profile of the crank fitting is much smaller than a folded pedal. See the Rivendell site for guidance on adding pins. Rivendell also sells pins but any small track pins and some Loctite should work.