Normally, when I set up a front derailleur I follow Shimano's recommendation about having 1-2mm of clearance between the large chainring and the derailleur cage. This has always worked will for me, resulting in crisp shifting. Since building up my Sam Hillborne back in June I've been running the CX-70 derailleur at this height but find I have to constantly trim the derailleur to keep it from rubbing the chain. At this setting I can only get a few shifts on the rear before having to adjust the front. Quite annoying. I primarily use the large chainring, doing most all the shifting on the rear, so having to constantly trim the front was getting old quickly. Another issue was that there was little room for adjustment between the inside of the cage rubbing and the outside of the cage rubbing. I notice that I didn't have the same problem when on the small chainring. Then I noticed that the front of the cage is a lot narrower than the back, and when on the large chain ring the chain is positioned between the cage near the front, while the chain ride between the cage more toward that middle to rear when on the small chainring. So that got me thinking that perhaps raising the derailleur up a bit would give me more clearance between the sides of the cage when in the large chainring, with affecting the shifting too badly. So today I raised the derailleur to that there is 7mm of space between the large chainring and the cage. I'm happy to report that this has made a huge difference in my enjoyment of riding the bike. I can shift 5-6 cogs on the back before I have to touch the front shifter to trim the derailleur. And when I drop the front down to the small chainring, with the chain on the rear cluster anywhere from the middle to the largest cog, there is no need to readjust the front to keep the chain from rubbing the cage. Pure heaven. And the shifting performance has not suffered either. Now granted, I don't ride this bike in a peloton of riders, inches of the wheel in front of me, where every shift is critical, but I've not noticed a decrease in the crispness of the front shifts.
Thought I'd put this out there in the event anyone else was suffering with the same issue. David -- 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.
