No, I wasn't trying to suggest that, rather only to point out that, from another perspective, namely within the context of the OP, I could understand Sreten's points.

Yes, the dialogue strayed quite a bit into the various ways in which a 'group rideable' 20er could be constructed, but again, I think Sreten read-- as did I-- the OP as trying to understand the capabilities of standard, off-the-rack folders, evidenced by his comment, "Only a select few small wheeled bikes have gears (speed) that roughly matches a standard road bike. I'm talking 18 speeds and up. Can a 20 inch wheeled bike keep up in group rides?"

That, to me, is not the comment of someone who's aware of Capreo hubs, 60t chainrings, or 10t cogs, and if that's true, then I can understand Sreten's view that, dude, nobody is gonna jump on a LBS Tern or Craiglist Dahon and keep up with the typical club road ride. That opinion does not preclude modding said 20ers, your Miami, or any other 20er to do the duty.

Also, a reminder that Sreten also has at least one 20er, and is 'in the family,' so to speak. I don't think he was trying to dog or otherwise bad-mouth 20" wheels, frames, or bikes, rather just to point out that most are not constructed for fast road work.

That's my opinion on where he was coming from, at least, and you're of course in no way obliged to agree.