yom tov

Question

on yom tov (or on shabbat in a real karmelit with a real valid eruv) is it ok to a)ride a bike b)use a rain umbrella (you said there is no problem with ohel because it is made to open and close) note: when a question is in the waiting area for a while and then you answer it, it falls back into date order of when it was asked. this makes it hard to notice when one of those are answered. it would be good if the most recently answered would stay on top. It would be a shame to miss reading one of your answers)