Southwestslacker1
Retro Guru
I've got a mystery Columbus tubes frame (no paint, no serial number, no clues) I'm just trying to make an educated guess at the tubing type using measurements and the Columbus tubing chart.
My question is regarding the helical reinforcement inside tubes, does this extend from end to end right through the tubes or does it stop before the butted sections?
Also how long are the butted sections at the ends of the tubes?
I can get a little look up the inside of the down tube and seat tube through the BB shell but can't see any obvious spiral, but I don't know if I'm looking far enough.
Any help/advice would be appreciated.
My question is regarding the helical reinforcement inside tubes, does this extend from end to end right through the tubes or does it stop before the butted sections?
Also how long are the butted sections at the ends of the tubes?
I can get a little look up the inside of the down tube and seat tube through the BB shell but can't see any obvious spiral, but I don't know if I'm looking far enough.
Any help/advice would be appreciated.
