I wouldn't be surprised if it is the ring spread. I may go with a 42 or even 40 - don't need much on the top end these days - I like to coast down hills, and the 11t in back is a big gear. Derailleur was new, not moved, and the rings are new, unramped. I had a fair amount of small ring to big ring chain suck originally with 9-speed chains, so the CX70 got some wear from that early on until I moved to 7 and then 8 speed setups. Never had this issue with the Campy - it just popped out one day. The big jump theory holds weight.
Brian On Monday, August 18, 2014 8:41:55 AM UTC-7, Michael Hechmer wrote: > > The only FD I have broken in 35 years was the clamp on a pretty Chorus. > 16 is a big lift and does stress the derailler, getting the chain stuck > between the derailler and ring could weaken the joint. The bottom of the > derailler has more flex while the top is secured, so maybe that contributed > to weakening over time. How are the rings? Ramped? New or worn? > > Just as an aside, don't you find that 16 tooth difference creates an > awkward shifting patter? It always seems to me that you are making many > shifts harder in order to get half a gear lower at the bottom. > > Michael > > On Monday, August 18, 2014 10:58:11 AM UTC-4, lungimsam wrote: >> >> That's bizarre. You would think a derailer wouldn't break like that at >> that place because any pressure/ movement would make the derailer move, not >> resist and break. >> Does the chain sometimes jam between the big ring and the derailer when >> shifting into the large ring? That's the only thing I can think of that >> would stress the cage to make it break like that. But I am no expert. Chain >> suck maybe? Old age? >> Mine jams sometimes. Operator error I think. Shifting too far too fast. > > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
