Originally Posted by
ezridernc
That's the funny thing - it never missed a shift on a bike stand. It would mis-shift about half the time while riding, specifically going from the small ring to the large ring. I would press the shiftlever in and the chain would go up but when I let go of the lever, the chain would drop back down.
Now this sounds like my qualification. the ft der wasn't well adjusted. If the up shift to the large ring did, in fact, occure and the chain engaged the ring's teeth then the only way for it to spontaneously down shift is because the der was pushing on the chain trying to down shift it.
The qualifications on this is that the lever is working well, that with proper lever/der cage travel the lever will engage the high gear ratchet and stay put. Too tight a cable could also cause the lever to almost but not quite engage the pawl. Andy.