Yes pretty much every bike has the frame number on the bottom, although in my experience the frame are heavily powdercoated, as is my Dahon and I cant read the stupid number, I cant tell the 8’s from the 9’s lol
If no-one minds me joining in this thread, I would appreciate some feedback on my Brompton comment below
My Brompton however doesn’t have a frame number on the bottom, is on the rear, beside the downtube of the seatpost. I assume it’s the frame number as its only 6 digits long and the only other identification besides the edition number is the serial number sticker and some other sticker below it with 2 sets of random numbers, not sure what relevance they are