Matt, I just saw this thread. I had your exact same problem (compact double crankset w/ 46-30 rings + front derailleur). When shifting from small to big, it wouldn't or the chain would jump over onto the crankarm. I was sure I installed the correct front derailleur.
I examined the FD I installed and saw that it was my IRD *Alpina-d* for triples (wrong one for this use-case). OLD EYES, I'm guessing. I dug out my IRD *Sub-C *and, of course, all was right with the world - excellent shifting with the compact crankset. The IRD Sub-C <https://www.interlocracing.com/shop/732003-ird-sub-c-front-derailleur-v2-double-braze-on-6827#attr=> is just another potential solution for your crankset combo (unfortunately I checked and it seems to be out of stock and is backordered at many retailers). Good luck, Jeff Claremont, CA On Thursday, February 23, 2023 at 7:27:42 PM UTC-8 mmille...@gmail.com wrote: > Thanks all. When the FD was lowered, the chain could not climb up to the > big ring. First thing he did was lower it. I tried it myself, when I first > got the bike. > > I just ordered a cx70. If that doesn’t work, I’ll get new VBC or figure > something out. > > Also figured out the brake levers were long pull. So that explains part of > the braking issue. Brakes are overrated! Ha. > > Matt > > Sent from my iPhone > > On Feb 23, 2023, at 9:16 PM, Joe Bernard <joer...@gmail.com> wrote: > > The hiccup here is his double is really more of a triple with the middle > ring removed; lifting a chain from 28t to 46 is a big climb. I'm not sure a > double is going to cover this, but I agree lowering the derailer is a good > idea. > > > > On Thursday, February 23, 2023 at 5:52:25 PM UTC-8 Nick Payne wrote: > >> Your FD needs to be lowered a fair bit. At the point of closest approach, >> there should be only about 2mm clearance between the top of the chainring >> teeth and the outside derailleur cage as it passes over the teeth. I have >> doubts about the experience of your "experience" mechanic if he positioned >> the FD where your photo shows it. Making that change will mean that the >> cage won't have to move so far outboard to get the chain onto the big ring. >> And if you're only using two chainrings, fitting an FD intended for a >> double rather than a triple would also improve things. The sculpting of the >> cage on a triple FD is intended for use with chainrings where there is a >> reasonably large jump in the number of teeth between the granny and middle >> chainrings, and a considerably smaller jump between the middle and outer >> chainrings. >> >> Nick Payne >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "RBW Owners Bunch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/rbw-owners-bunch/Zg1lQo3p8cY/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > rbw-owners-bun...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rbw-owners-bunch/10fb423e-0cbc-4088-a95f-df59b61ceec5n%40googlegroups.com > > <https://groups.google.com/d/msgid/rbw-owners-bunch/10fb423e-0cbc-4088-a95f-df59b61ceec5n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/319daa97-9eb0-4a2a-b076-4481dd73e259n%40googlegroups.com.
