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Shimano rear derailleur cable help needed

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Shimano rear derailleur cable help needed

Old 10-17-21, 02:11 PM
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beb123
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Shimano rear derailleur cable help needed

I need to replace the shift cable on my Shimano Ultegra rear derailleur and I'm not sure if it's run correctly. I had replaced it a year or so ago and when in the highest gear there is quite a sharp angle between where it comes out of the adjusting barrel and where it is anchored. This has led to the cable fraying. Is this normal? Sorry I can't post a photo as I'm new here...
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Old 10-17-21, 02:41 PM
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Originally Posted by beb123 View Post
I need to replace the shift cable on my Shimano Ultegra rear derailleur and I'm not sure if it's run correctly. I had replaced it a year or so ago and when in the highest gear there is quite a sharp angle between where it comes out of the adjusting barrel and where it is anchored. This has led to the cable fraying. Is this normal? Sorry I can't post a photo as I'm new here...
given that the anchor point moves wrt the adjusting barrel, itís not going to exit cleanly from the barrel all the time. For some gears there will be an angle. A pic will help, but if the gears shift cleanly and accurately, then the chances are that your cable is routed correctly
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Old 10-17-21, 02:44 PM
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Originally Posted by beb123 View Post
I need to replace the shift cable on my Shimano Ultegra rear derailleur and I'm not sure if it's run correctly. I had replaced it a year or so ago and when in the highest gear there is quite a sharp angle between where it comes out of the adjusting barrel and where it is anchored. This has led to the cable fraying. Is this normal? Sorry I can't post a photo as I'm new here...
Do a search for the Shimano derailleur owners manual. It will show the proper routing of your cable. You need to know what version of Ultegra you have though. 6500.6600, etc.
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Old 10-17-21, 02:58 PM
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It's most likely correct, they made a special ferrule for that end of the housing that had a little tube coming out for an inch or so that reduced the friction of the cable against the derailleur. Just takes longer to fray and fail.
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Old 10-17-21, 03:21 PM
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There should be a groove, or arrow on newer models, on the pinch bolt mounting point to indicate which side the cable should go.

Note that the older RDs have a smaller distance between the cable exit point and pinch bolt than the newer models. If you compare to a SRAM X series, the older RDs' point is also likely closer.

Last edited by KCT1986; 10-17-21 at 04:12 PM.
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Old 10-17-21, 06:04 PM
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Originally Posted by beb123 View Post
Sorry I can't post a photo as I'm new here...
Found your derailleur photo .

https://bikeforums.net/g/picture/22809962
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Old 10-18-21, 11:35 AM
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[QUOTE=cobba;22273544]Found your derailleur photo .

Yes that's it! Is that normal?
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Old 10-18-21, 01:04 PM
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That's unfortunately normal. My last post wasn't entirely correct. There is a little plastic tube that comes out of the barrel adjuster and keeps the cable from rubbing directly on the derailleur. It's not actually part of the ferrule. The part # is: Y5XX38000 Cover with tongue.
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Old 10-18-21, 02:09 PM
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[QUOTE=beb123;22274324]
Originally Posted by cobba View Post
Found your derailleur photo .

Yes that's it! Is that normal?
Is your RD the RD-6800 GS (mid-cage for triple crankset)?
If so, couple of issues; 1. as mentioned above, there should be an insert between the cable adjuster barrel and the exit point. See the Shimano tech doc. (Exploded view). Easy to find, do a web search.

2. Double check routing at the pinch bolt for an arrow marking for cable routing. The RD-6800 strangely uses different sides of the bolt for SS and GS. The routing in the photo is for SS. See the Shimano tech doc. (DM Dealers manual).
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