Originally Posted by
HillRider
One problem is that,
AFAIK, no one makes a rear derailleur with a jockey pulley that will clear a 40T cog. Even long cage MTB derailleurs are rated for 36T max. I know Sun Tour made a 38T cog freewheel in the past but I have no idea which of their rear derailleurs they matched it with and, that was before indexing and cassettes.
I’m no expert and when I put the 36 on I could see I was getting close. I don’t know if the mounting point for the RD could be moved down on the dropout seeing as how the small cog it’s designed around is an 11 and would be going to a 14. I know it’s not one for one. I’m pretty sure I could make a 40t cog that would work but I don’t think I want to build a new RD though.