SteelNipple
Dirt Disciple
In the 1985 Gitane catalog the seat post size for Professionel is stated to be 26.4 and mine came with 26.4mm(SR laprade, not original) but it's little loose and the clamp bolt ears were clamped together. I don't have a 26.6mm and 26.8mm is too large. Also what gauges the tubes would be for metric Reynolds 531 Competion? 28.0mm-26.6mm=1.4mm so 0.7mm and 0.9/1.0mm butt at the bb?