High (low?) limit screw too short?
08-29-11, 09:22 AM
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Low limit screw too short?
I am having a bit of trouble getting this Chorus RD tuned.
it is just touching the spokes on the largest rear sprocket and I would like to back it off a bit.
But the limit screw, fully screwed in, doesn't engage with the stop bit.
what am I doing wrong?
I can't believe that I need a longer limit screw.
suggestions?
Peter
it is just touching the spokes on the largest rear sprocket and I would like to back it off a bit.
But the limit screw, fully screwed in, doesn't engage with the stop bit.
what am I doing wrong?
I can't believe that I need a longer limit screw.
suggestions?
Peter
Last edited by pstock; 08-29-11 at 01:04 PM.
08-29-11, 10:22 AM
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If you're trying to limit how far the derailleur can travel toward the spokes, then you adjust the Low (L) limit screw, since you're trying to position it under the low (largest) gear. So, make sure you're adjusting the correct screw. Is the other screw touching the derailleur body when in the largest gear?
08-29-11, 11:52 AM
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Also confirm that the chain is on the smallest chainring and largest cassette cog when adjusting the low limit screw.
08-29-11, 01:01 PM
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thanks
But that is the Low LImit screw shown in the photo. screwed in all the way, it still doesn't catch the flang bit there.
Now, I notice that these High and Low Limit screws actually have springs on them, between the screw head and the derailleur body. when the screw is in as far as it can go, this spring is compressed and takes up enough space that the screw doesn't reach the flange.
if I remove that spring, I can get enough travel on the screw to hit the flange and keep the derailleur out of the spokes.
should I have to remove the Low Limit Screw spring?
But that is the Low LImit screw shown in the photo. screwed in all the way, it still doesn't catch the flang bit there.
Now, I notice that these High and Low Limit screws actually have springs on them, between the screw head and the derailleur body. when the screw is in as far as it can go, this spring is compressed and takes up enough space that the screw doesn't reach the flange.
if I remove that spring, I can get enough travel on the screw to hit the flange and keep the derailleur out of the spokes.
should I have to remove the Low Limit Screw spring?
Last edited by pstock; 08-29-11 at 01:05 PM.
08-29-11, 01:11 PM
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Not personally familiar with Campy RDs so can't comment on that.
Look at the RD cage from behind. Does it look straight up and down, parallel to the frame/wheel? If it's bent in, that could explain why the L screw isn't doing anything. The RD hanger (or less likely the derailleur itself) may be bent in.
Look at the RD cage from behind. Does it look straight up and down, parallel to the frame/wheel? If it's bent in, that could explain why the L screw isn't doing anything. The RD hanger (or less likely the derailleur itself) may be bent in.
08-29-11, 02:39 PM
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It's hard to tell what is going on from the picture. If the bike is upside down turn it right side up and take a few more pictures, especially one from the rear. I was also wondering if the derailleur or derailleur hanger could be bent.
08-29-11, 05:24 PM
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Looks like u have more turns in the screw, IMO. Always what u can do is to put a spacer between the wheel and the cassette to move it out a few mm. Is that a 9 speed setup?
08-29-11, 07:58 PM
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I am having a bit of trouble getting this Chorus RD tuned.
it is just touching the spokes on the largest rear sprocket and I would like to back it off a bit.
But the limit screw, fully screwed in, doesn't engage with the stop bit.
what am I doing wrong?
I can't believe that I need a longer limit screw.
suggestions?
Peter
it is just touching the spokes on the largest rear sprocket and I would like to back it off a bit.
But the limit screw, fully screwed in, doesn't engage with the stop bit.
what am I doing wrong?
I can't believe that I need a longer limit screw.
suggestions?
Peter
08-29-11, 08:09 PM
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don't try this at home.
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How many cogs do you have? Are you on the largest cog (of 5?) in the photo?
Yes, that is the correct limit screw, and it's already extended far more than is typical. If your cog set is only 5 speed, is it narrower than what the derailleur was designed for?
More pics, please. A view from the back of the bike, and a side view, etc.
Yes, that is the correct limit screw, and it's already extended far more than is typical. If your cog set is only 5 speed, is it narrower than what the derailleur was designed for?
More pics, please. A view from the back of the bike, and a side view, etc.
08-30-11, 01:34 AM
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That is an older Chorus RD. In the early 90s, they came with an extra longer screw in the box for 7 speed freewheels. So it is possible that ypu need a longer screw.
09-01-11, 03:42 PM
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more pics
and it currently has an 8 speed wheel
09-01-11, 04:05 PM
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09-01-11, 07:46 PM
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