I have eXpedo removable pedals on my Frog and love them. They are a variation made by WellGo, with the same, simple attachment mechanism. I suspect the bearings aren't as good as the MKS pedals, but I have had no problem in over a year of regular use. I've also used the MKS EZ Superior pedals (the ones without the plastic rings). I prefer the eXpedo/WellGo to the MKS.