I just bought a Panasonic DX-4000 with Tange Champion Motocross tubing. Has anyone heard of this kind of tubing. It is strange because usually Tange tubing is numbered, but this one just says "Champion Motocross" and "Chrom-Molyden Butted"
The bike is around 1982, as determined from the frame serial and the dating on the suntour cyclone M-II drivetrain. It also has Dia Compe Gran Compe NGC 400 sidepull brake sets. Overall, a pretty nice ride and good condition.
Pics soon. Thanks for your comments.