Kyle.B.H. wrote:
I'm having problems (again) shifting from my middle to granny under
load. I just replaced my moderately worn 40t middle with a new 38t,
and
the problem crept up again. I have already taken the measures of
filing
away the portion of the derailer that conatcts the frame, filing a
small
groove in the seat tube itself, and even moving my chainline outward
about a mm via a BB spacer, and still no success. It shifts fine
when
not under load, but once you start up an incline, forget it, it won't
go. Its an Ultegra der. and TA Alize rings.
So now I'm thinking I'll file the tops off of two consectutive teeth
in
the middle ring to aid the shift. Don't some chainrings include this
as
a feature?
A) Think this will help?
B) If I do this, where on the ring (relative to the right crankarm)
would I file the teeth?
C) Any other suggestions?
Thanks,
Kyle
Perhaps the 6603 front der which is designed for a 39t middle ring,
with the appropriate ramps to get the chain to the granny.
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