Don’t bother getting worked up. There’s no point in entertaining the opinions of a guy who thinks the hats worn by all gadolim are ohel/beged-isha, but does not think umbrellas are ohel contrary to the opinion of just about everyone (even probably Avi Weiss).
Bicycles did not exist at the time of the Shulchan Aruch. If people are really using the argument “the S”A didn’t know about it yet, so it must be mutar” then the proper thread is this one:
http://www.theyeshivaworld.com/coffeeroom/topic/lets-make-yct-teshuvas-by-popa