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right shifter / rear derailer problems(6 posts)

right shifter / rear derailer problemsSherpa
Jun 27, 2003 4:53 AM
I've been wanting to learn more about how my bike works and how to put my bike together and apart (etc.) - so I embarked on replacing my shifter cables (which were way over due for a change). I headed out to the garage with my Leonard Zinn book in hand.

After some time I had the bike is back together, but now I'm having some minor problems that I need help with.

I've got a 12-25 cassette on. When in the 12, and starting to shift up, I feel an empty first click - the derailer doesn't move at all. After the first empty click, I can shift all the way up to the 25, but these upper gears are not so happy. When moving the chain back down, the chain almost immediately skips past the 23, and drops down to the 21. I'm certain I've got a tension adjustment problem. How do I solve it?

Any help is greatly appreciated,

Rich
no empty clicks...C-40
Jun 27, 2003 5:02 AM
Unless you have some sort of "ghost click" (9 clicks on a 9-speed or 10 clicks on a 10-speed), every click should make a shift.

If the first click does not shift from the 12 to the 13, then the cable tension is obviously too low. You may need to loosen the cable clamp bolt, screw the barrel adjusters in all the way, pull the cable tight by hand, retighten the clamp bolt, then start reapplying tension with the barrel adjuster(s) until the first click makes the 12-13 shift. Ideally, the RD will be centered on the middle cog.
Your cable sounds way loose.OldEdScott
Jun 27, 2003 5:05 AM
You might want start the adjustment again from scratch. Loosen the cable at the derailleur, take up more slack by hand, retighten, then fine tune as Zinn advises with the adjuster barrel. Try the Park Tools site for help. I like their insturctions better than Zinn's.
Try this:Spoke Wrench
Jun 27, 2003 8:21 AM
1. Disconnect your shift cable at the derailleur.
2. Turn your crank by hand. This should cause your derailleur to shift onto your smallest rear cog.
3. Cycle your shifter several times to be sure that it is in the hardest gear position. (This is probably what you did wrong the first time around)
4. Grab your shift cable with needle nose pliers, pull it taut and run it across the TOP of the anchor bolt. Anchor the cable in place.
5. Now attempt to shift through the gears one-at-a-time. It should require only minor adjustments with the barrel adjuster located where the cable enters the derailleur to make the chain "happy" in all of the gears.
Hey Spoke: Say Number 3 again. What's 'hardest gear position?'OldEdScott
Jun 27, 2003 9:29 AM
Hardest to pedal. (nm)Spoke Wrench
Jun 27, 2003 2:31 PM