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Old 08-20-11, 10:42 PM   #1
jgeretz
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Need help adjusting Shimano ST-4500 with FD-4500

As far as I understand, the 4500 shifter can be used either with the 4500 (double ring) or the 4503 (triple ring). My bike has the double ring.

My problem is, my setup seems to be adjusted for a triple ring - it takes two shifts to move the derailleur to shift the chain in either direction. Moreover, the shifter shows three positions for the red indicator. My understanding is that with a double ring, only two of these positions should be in use. But that's not what is happening. When the indicator is to the left, I'm on the large ring. Hit the downshift lever - the indicator moves to the center, the derailleur moves toward the inside, but not enough to shift the chain. Hit the downshift lever again - the indicator moves to the right and now the chain jumps to the small ring. Moving back to the large ring, it's the same process in reverse.

The setup is functional, however I'd very much like to be able to make the shift with a single, rather than a double tap. If you can offer any suggestions as to how to correct this, I will be most grateful.

Thanks!
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Old 08-20-11, 10:57 PM   #2
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my front campy shifter has about 6 positions (clicks). It takes 2 or 3 clicks to move from the 39 to the 53 ring. I kinda like it like that. I have room to slide my cage in or out by just a milimeter or so. this comes in handy when im in the 53 up front and the 24 in back or 39 front and 15 in back (13- 26 cassette) I can bump the cage over just a smidge to allow for chain clearence (trim).
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Old 08-20-11, 11:38 PM   #3
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Sure, I like the ability to trim, but I should be able to adjust this so that I can press through the trim position straight through to the full shift, without having to double-tap.

With your campy, each click requires a separate tap, or can you press straight through to go through several clicks, enough to shift the chain? That's what I am trying to achieve. According to spec, I should be able to adjust this for a double ring so that a half press will trim the derailleur, while a full press should shift. I'm just not sure what needs to be adjusted.

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my front campy shifter has about 6 positions (clicks). It takes 2 or 3 clicks to move from the 39 to the 53 ring. I kinda like it like that. I have room to slide my cage in or out by just a milimeter or so. this comes in handy when im in the 53 up front and the 24 in back or 39 front and 15 in back (13- 26 cassette) I can bump the cage over just a smidge to allow for chain clearence (trim).
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Old 08-21-11, 11:16 AM   #4
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Well, I got this fixed. The problem was way too much cable slack on the lowest gear. So the first shift was mostly taking up the slack, not shifting the derailleur enough for a true shift. I took up all the slack and now a single full shift in either direction moves the derailleur sufficiently to effect the shift. (And a half shift will trim the derailleur without shifting.)

(Somewhere there is a planet with every bike perfectly adjusted, populated by creatures with three hands!)
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Old 08-21-11, 07:33 PM   #5
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With your campy, each click requires a separate tap, or can you press straight through to go through several clicks, enough to shift the chain?
Yes I can click through 3 positions in one sweep.
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Old 08-21-11, 10:58 PM   #6
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Yes, that's good, that's what I needed to achieve. You need to be able to for a quick shift. So I got this adjusted, I now click through two positions in one sweep for a quick shift.

Thanks for your suggestion.
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