Been thinking about those space saver spares for bikes lately, I actually thought it would be a fairly light weight decent width tire? Guess not...
Whatever it weighs, I doubt it weighs as much as the rear on my Cadillac build... :wink:
Cool bikes, good vision/design skills!
If you are building another one, make sure you put up a thread, would love to see it come together. "Scratch built bikes" looks like the right place for your work...