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Can't get my rear derailleur indexed

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Can't get my rear derailleur indexed

Old 02-10-10, 01:17 PM
  #1  
nycbianchi
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Can't get my rear derailleur indexed

I replaced the shifters and cables on my bike, and I'm having trouble getting it all tightened and indexed. Maybe it's because I'm just an amateur at these things, but maybe something is broken or misaligned?

The shifters are 9-speed Campy Record, bought used on eBay. I took them apart, cleaned and re-greased them, and everything looked okay to me. (Though just as likely I messed them up in the process.) The RD is a Campy Veloce.

The problem is that they jump around in the middle cogs, specifically the 6-8th largest. The RD shifts perfectly from the smallest cog to the second smallest, and pretty well from there to the next one, then the chain starts to jump around. I can't quite place the source of the skipping; the chain seems to be unhappy running from the RD pulley to the cassette but I don't know why.

Any suggestions? Do I just suck at indexing or could there be something wrong with one of the components?
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Old 02-10-10, 01:49 PM
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Al1943
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More information needed. What year were the shifters and derailleurs built. Campy changed the rear derailleur actuation ratio in 2001. The rear shifter and rear derailleur need to match.

Al
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Old 02-10-10, 01:54 PM
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nycbianchi
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Originally Posted by Al1943 View Post
More information needed. What year were the shifters and derailleurs built. Campy changed the rear derailleur actuation ratio in 2001. The rear shifter and rear derailleur need to match.

Al
Wow, that's a good question. I bought both the RD and the shifters on eBay and I honestly don't know when they were built. Is there any way to determine by looking at them?
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Old 02-10-10, 02:18 PM
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Originally Posted by nycbianchi View Post
I replaced the shifters and cables on my bike... Maybe it's because I'm just an amateur at these things...The shifters are 9-speed Campy Record, bought used on eBay. I took them apart, cleaned and re-greased them...
I think I see your problem. Why not drive the bike over to the LBS and see what they'd charge to take a look at it and get it sorted out?
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Old 02-10-10, 02:32 PM
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Originally Posted by bigvegan View Post
I think I see your problem. Why not drive the bike over to the LBS and see what they'd charge to take a look at it and get it sorted out?
Definitely an option; I respect the role of professional mechanics and I'm glad I have some good ones in the city. But I do like to try to figure these things out for myself if possible ... part of the reason I love cycling is learning about this stuff as I go.

Al1943, here are photos of the components in case that helps. (Not sure if you can tell what year they were made by looking at them.)

Brazil_Public0001.JPGBrazil_Public0002.JPG
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Old 02-10-10, 02:55 PM
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First off there's a great likelihood that you have the wrong cam. Your veloce RD is definitely post 2001, but your levers aren't. 9s levers built before 2001 said carbon BB system like yours. In 2001 with the advent of 10s they changed the marking to 9s or 10s. It's important because the old style 9s RDs used different shift cams than the new. If you want to replace the cam you need one marked" "1", (for 2001) as opposed to what you probably have which is marked "9".


Even if you have the right cam there's the chance that you rebuilt the levers improperly when you serviced them and didn't properly set the counter (spiral) spring on the levers. This is a common error and often leads to problems like yours.

Remove the righ lever, leaving the clamp on the bike. Take off the outer cover and look at the edges of the spiral spring as it sticks out from below he cover. The correct setting has the spring showing about one coil beyond the cover when slack and just barely disappearing under the cover when tight. If there are always coils showing, it's too loose, if it's always hidden it's too tight.

BTW, I ran Campy's east coast service center for a number of years and might have the cam you need. I'm in the New York area. PM me a phone number if you wish to discuss it.
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Old 02-12-10, 03:23 PM
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A quick post-script on this -- so that we have the solution recorded for the next person who runs a search on BF.

While there are in fact minute differences between the pre-2001 Campy 9-speed shifters and the post-2001 Campy 9-speed shifters, that wasn't the problem. In fact, according to this article from Sheldon Brown and an even better one from CTC here, they are compatible. The jockey pulley has enough play to cover the small differences in cog spacing.

The problem turned out to be a mis-placement of the cable-fixing bolt. I had it rotated out of position, so the cable was not routed straight through it. Therefore, as the lower half of the rear derailleur pivoted out, the cable was being pulled at a different angle, with a slightly greater radius. Hence, perfect shifting in the smaller cogs, poor shifting in the larger cogs.

Moral of the story: be sure to route the cable through the little groove in the cable-fixing bolt when you set up your RD.

Andrew
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