Interesting, although I would guess that's not how you feel about it. I
have never had this happen. My problem has been between the rings and I
now see that what I need are the 1.2 mm spacers. I am putting this on a
bike I hope to sell, and removing a DaVinci crank, which I like very much.
Back from the bike shop, where I purchased a set of 0.6mm shims ( 75 cents
a piece!). My past experience has been that this prevents the chain from
being sucked down between the middle and inner rings. My favorite mechanic
suggested a trick that should help with the gymnastics of holding all
Michael,
I had the chain suck with a number of RD2 cranksets. I found that the
index mark on the middle chainring needs to be at 1:00 when the arm is at
12:00. If the index is at 11:00, then shifting pins occasionally grab the
chain.
Regards,
Bill Lucas
On Saturday, March 2, 2013 4:14:30
On mine, the chain gets caught between the middle ring chainstay. When
this happens, the chain is on the inner ring at the top but the section
that's disengaging from middle to inner gets stuck between the stay the
middle. Visually, there appears to be more space between the inner
middle
Michael:
I can't answer your question but it does raise one on my part. I have the
Rivendell standard issue triple crank (XD2?) and have often been bothered
by chain suck on the middle-to-granny shift. Careful, well planned shifts
work fine. It's the panicky, sloppy ones where I don't ease
Hah! Is chainsuck a design problem then? I've suffered it in spades on
the Fargo with its XD2 and, after the last episode where it jammed so
hard it permanently twisted the chain and bent the outer ring 30*, I
had one of those catch-chain devices installed. I've not had this
problem, to this
Never ever happened to me on 4 different bikes. I always use the shortest
bottom bracket that will clear the chain stays and carefully set up the low
limit on the front derailleur. There is a plastic device that you can
attach to your seat tube that keeps the chain from dropping off too. I
Mike, you're thinking of chain drop, which can indeed be stopped with
careful setup and a chain catcher. This problem is chain suck. The chain
falls between the middle and small ring. I first discovered this problem
on a hi speed roundabout! Not good, not good.
Shims come in 1 2 mm
