I am currently using a Super Record rear derallier with a 6 speed freewheel 14 to 28 with no problem. Although on another bike with a Nuvo Record 26 tooth seems to be the max. I am not sure why. It may be the position of the wheel placement forward or backward in the drop out that makes a difference. Any one know if that has any effect?
Tom Dusky
Huntington Woods MI