Cool, I’m guessing those were Bromptons, with the suspension. I discovered my Raleigh 20″ folder is an excellent wheelie bike, I’ve been trying get wheelying, making some progress. Got about 3 pedal revs at the balance point. Riding a wheelie is on my bucket list. I’m trying to grow down.
For wheelies & manuals throw the butt over the rear axle and feather the rear brake to compensate if you over do it. Most people’s issue with that trick is trying to “pull up into” it. Practice throwing your butt back and just feel how your body will naturally rock the bike up. Doing them on a road frame (especially my fixie) has proven to be much more difficult and requires a strong initial kick of the pedal, but that’s in combination with the, um, butt thrust I mentioned a moment ago. Should be one fluid motion.