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Two middle rings...(4 posts)

Two middle rings...blakester
Apr 27, 2003 7:01 PM
When I shift up from my small ring (this is in front) to my middle ring, there seems to be two "settings" that I can be in, depending on how complete/hard I shift up. Both move the chain to the middle ring, but one puts the derailer too far out and it rubs on the chain. I can then shift again (what feels like almost a third shift) up into the largest ring. Is this common, and how is it fixed? (I'm on an ultegra derailer) Also, are the only things to change to effect the fronat derailer the H/L limit screws and the cable tension? Thanks!
Normal & by designScot_Gore
Apr 27, 2003 7:19 PM
Your Utltegra level equipment is designed with a "trim" feature.

That extra shift is more like a half a shift right?

The half shift is designed to allow you to "trim" your alignment to eliminate chain rub that may occur depending of the disparity between your chain placement between the front and back sprockets. AKA: how crossed chained you are.

Normal & by designblakester
Apr 27, 2003 8:27 PM
yes it does definitely not feel like a full shift. How do I use this to my advantage? (I did notice that at some times I'll get chain rub both when running on the small extreme back end, and the large extreme back end) while maintaining the same gear in front.
Sounds NormalScot_Gore
Apr 28, 2003 3:44 AM
I'm by no means an expert so maybe someone with more wrench time than me will chime in, but, with 9 in the back and 3 in the front, there's going to be certain gear combos that are unavailable to you. If you find yourself in a gear with rub and can't trim it away, time to search for a better gear. Look at your gears when this happens, you'll likely see it moving from front to back a pretty good angle. There's another gear in that mix that will give you almost the same ratios, go find it. With just a little practice you'll learn the working gear combos and naturally drop to them with out a thought.

my 2 cents.