I'm experimenting with an old steel frame to see if I can turn it into a colapsible bike. BAsically I want to cut the top tube and down tube near the seat tube and either slip a collar around the outside or a narrower diameter tube inside, drill through, and bolt together.
What I need to know is if there are standard diameters that will fit, ie, can I get a diameter tube that will fit over a standard top and down tube?
I'm assuming it must be a standard size, because lugs must be made out of it, right?
If I'm right, can someone tell me the diameters.
Also, can anyone tell me if drilling and bolting will weaken the frame any? I'm assuming it's safe, as there are places on a frame that are already drilled (cage bosses).
I know it's not an ideal solution, but like I said, it's more an experiment than anything.