Hello,
I have an issue with trying to find a replacement for 35 x 31, 35 x 25, and 30 x 26 mm DURAL tubing.
I am working with this design: http://home.caiway.nl/~fnijhuis/zekitez/buggy/sb_buggy.html
If you look at the way the Down tube (tube AU4G 35x31 L=500 mm)attaches to the Central frame...