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Weird shifting problem with RD 105 ?!?

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Weird shifting problem with RD 105 ?!?

Old 09-30-08, 01:21 AM
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drPD
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Weird shifting problem with RD 105 ?!?

My bike is new (~300 Km) full Shimano 105 9 speed front 53-39 and back 12-25.

I am having a problem shifting at the end of cassette (smallest cog) while I am on the big ring. When I'm on the road, shifting is sloppy and won't shift at all from 13 to 12 cogs. Sometimes I have the same problem in shifting from 15-13 cog. When it's in the stand or when I am on road very ease on pedal, shifting is perfect, works how it's supposed to, and I can't detect any problems. When I'm in the small ring, shifting is just fine. It's only the big ring where I am having trouble.

I have taken the bike to LBS to fix it after reading many posts here where I found to check the hanger alignment and I have insisted they check the hanger alignment. They correct the hanger aliment (and check other things) but the problem exists.

I visited techdocs.shimano.com before and download FD and RD docs. I tune FD and RD without problem (I have two another bikes and there is no problem in tuning FD and RD).

The problem is weird because is appear only under load on road but no in the stand or when I am on road very ease on pedal. I can shift from 13 to 12 cog but I need to tap two time shifter to make click and drop from 13 to 12 cog.

Any ideas where to look next?
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Old 09-30-08, 05:01 AM
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Is your RD securely attached to your frame? I'd double-check the two screws holding it on.

Another guess is that your bottom bracket has some play in it that is accented when you are in the big ring. Try grabbing both cranks arms and rocking them back and forth. If there is any play, your BB is the problem.
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Old 09-30-08, 05:35 AM
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Originally Posted by drPD View Post
<snip>Any ideas where to look next?
Ultegra.

Beth
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Old 09-30-08, 06:26 AM
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Is your chain too long?

If you hadn't had it checked, I'd say to pursue the der hanger as well.

Have you tried turning your barrel 1/4 turn clockwise? Does that kill shifting at the other end of the cassette, going to bigger cogs?

Are you sure your limiter on that side isn't just a touch too tight? (this wouldn't explain the 15->13 shift though)

How old are your cables and housings? Depending on normal riding conditions, these can gunk up pretty quickly, and sometimes the rear housing gets a bit of a kink going into the barrel. Try shifting all the way to your biggest cog, then shifting to the smallest without turning the cranks -- this will leave the der hung up on the left while loosening the cable. Now take the housing out of the cable stop on the chain stay, then pull the housing way up the cable to see how easily the cable slides through. Make sure there aren't any kinks or frays anywhere.

No offense to the first posters, but there's only one screw holding on the rear der, and this problem is not caused by 105. If you had the same cause, Ultegra, Dura-Ace, Sram Red, Super Record, etc would all be affected by it. Maybe not electronic DA
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Old 10-04-08, 01:52 PM
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I suspect that my rear mech may have a weak return spring. How can I check it and how to replace?
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Old 10-04-08, 03:58 PM
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Also check the cassette lock ring.
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Old 10-04-08, 04:15 PM
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Replace the cables and see where that gets you.
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Old 10-05-08, 01:06 PM
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Originally Posted by sfrider View Post
Also check the cassette lock ring.
Cassete lock ring is there, hm , what I need to check there?
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Old 10-10-08, 05:38 AM
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I have solved the problem and thank you all to participate in solving the problem. I hope this could help you if you face the similar problem.

The housing near RD was bended immediately upon leaving the barrel adjuster. This was actually bending the housing end cap. The first image show how was before.
When I put the housing below quick release axle the housing near RD is not bended immediately upon leaving the barrel adjuster. See the second image.

Yes this is temporary solution and I need a longer housing in this case allows the housing to enter straight.
Attached Images
File Type: jpg
Before.JPG (90.0 KB, 7 views)
File Type: jpg
After.JPG (87.1 KB, 6 views)
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