Originally Posted by
oneclick
And further, in regard to the chain jamming when he tried a mounting it lower, likely it wasn't lower enough as "enough" would mean the cage would certainly be hitting the rear mech cable.
The lower edge of the inner cage plate can cause a jam if it is at a certain (slightly too high) level.
The top inner edge of the chin rides up that cage plate edge and if the 3-D alignment is *just* wrong one of the chainring teeth will catch the diagonally opposite edge of the same chain link.
Yeah, that's exactly what was happening when I tried to lower it... I'm going to see if swapping out the delrin guide for a metal one might get the RD cable a little lower and get me a little more lower with the FD...
Early AM 30mi ride today I managed to
not drop the chain off once by making shifts from the middle to the big ring much slower....