bicycle frame methodology

I am trying to draw a bicycle frame in 3D. What is the best functions to use? I first drew the frame in 2D using regular lines. Next I drew a circle at one of the intersection points, then used Sweep. I repeated the steps but with a smaller circle. Next i was planning to Subtract the smaller tube with the large to create a tube but I am having trouble selecting to subtract to make a hollow tube. I'd like to revaluate to see if there is a easier way to draw so that it is easy to modify down the line.

Use _REGION on the two circles and _SUBTRACT prior to sweeping.

Solidedit > Shell will work and you don't have to draw the extra circle, extrude, etc.

You can also draw a circle at the end of the tube and use PressPull to subtract.

Sweep of region is the far easier method - see http://home.pct.edu/~jmather/content/CAD238/AutoCAD%202007%20Tutorial%208.pdf

"Yeah, well, that's just, like, your opinion, man."

The Dude

Not just opinion - it is fact.

I assume the frame is more than one tube.

I assume there might even be bent pieces.

There might be multiple sizes (diameters) of tubes.