Originally Posted by
catfour
Hi, need a little help here from the Brompton experts. I have just upgraded my Brompton 2-speed to a 6-speed. The 3-speed BWR hub is working fine, but I can't get the 2-speed derailleur to run smoothly in the lower gear (larger sprocket). The shifting from the small cog to the big cog works ok, but during pedalling it feels rough. I could feel vibrations through my feet. It doesn't happen in the small sprocket though.
I have already tried adjusting the derailleur, and even tried out a newish one, with no difference. It was working well before I upgraded to 6-speed. Does anybody have the same experience, and if so, how did you solve the problem? Any suggestion will be most appreciated. Thanks.
Did you swap out the chain as well? The new system may need a different length and or width chain. Could also be a chain line situation. Have no experience with Bromptons, but changing chainrings and sprockets/ cassettes can effect chain requirements.