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Sram Road HRD Shifter - cable coming undone?

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Sram Road HRD Shifter - cable coming undone?

Old 09-11-19, 10:19 AM
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Metis 
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Sram Road HRD Shifter - cable coming undone?

Force 22 HRD right/rear shift cable keeps coming out of the holding slot within the shifter. It's happening increasingly frequently where I'll go to shift mid-ride/race and lose the ability to shift. Basically the little barb on the shift end of the cable comes undone from the retention slot somehow and of course the derailleur pulls on the cable and I'm stuck in the hardest gear for the rest of the ride. Anyone had this happen?

My Ultegra 6800 shifters had a design with something like a 270 degree bend frayed the cables over time and I'm curious if these shifters are prone to something similar. Fixing this involves undoing the cable from the rear derailleur, removing the covers from the shifter, and pushing the cable back up and through to rehook it into the cable holder. I've also replaced the cable on the shifter multiple times so the next step is redoing the housing (internally routed mess).



Shifter cable comes undone from the red cable housing during riding.
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Old 09-11-19, 04:02 PM
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redlude97
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Undo the cable at the RD. Slide the cable in the housing. Does it slide smoothly across the whole range? I'm guess the housing/cable are gunked up and the derailleur tension isn't enough to keep the cable end in the holder,
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Old 09-12-19, 06:13 AM
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dsaul
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The only way for that to happen is the shifter moves and the cable doesn't. It has to be a cable friction issue and the housing is probably to blame. It could be worn or dirty cable housing or there may be some sharp bends in the housing that were fine when it was new, but are causing friction with some wear on them.

Another possibility with SRAM is the rear derailleur parallelogram pivots. The GX rear derailleur on my gravel bike gets sticky when the pivot points get dirty. It doesn't cause the cable to come out of the shifter, but it does cause a delayed upshift(harder gear). Its not that big of a problem on the gravel bike, because hitting bumps overcomes the frction and causes the derailleur to move. On a road bike, you may not hit any bumps that would cause the sticky pivots to break free quickly enough.
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Old 09-15-19, 06:54 PM
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Metis 
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Strange, I had a bike shop replace the cable and housing but the same thing happened at the end of the ride. So frustrating. The shifters are 6 months old and the derailleur isn't much older. I'm thinking something happened within the shifter that's not obvious just by glancing inside. Doh!
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Old 09-15-19, 08:55 PM
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Geekage
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Funny, my HRD Apex and S-700 shifters aren't slotted, so they don't and can't have that problem.

I'd kludge a fix by somehow fixing the cable head into place, say putting a small self tapping screw behind it, filling the slot, or something.

Admittedly, mine are older models. So why are yours slotted? Because they're newer or because they're higher end?
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Old 09-18-19, 02:29 PM
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Redbullet
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I think it might occur frequently in this situation: You shift 3-4 (or more) cogs at once toward the small cog, without pedaling. The cable loses tension, but the chain does not allow RD to move full range for that multiple shift. This makes the cable to comes out of the holding slot within the shifter (the red barrel rotates, but the cable does not follow its move). When start pedaling, the RD completes full move, but the cable falls to get back its normal place on the holding slot. If so, the only solution is to put the cable back with some sort of tweezers or small screwdriver.

It happened to me a few times with Force 22 - road, on the repair stand. I noticed that the only way to avoid it is to never make multiple shifts at once toward the small cog, without pedaling.
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Old 10-02-19, 06:40 PM
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Metis 
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Originally Posted by Redbullet View Post
I think it might occur frequently in this situation: You shift 3-4 (or more) cogs at once toward the small cog, without pedaling. The cable loses tension, but the chain does not allow RD to move full range for that multiple shift. This makes the cable to comes out of the holding slot within the shifter (the red barrel rotates, but the cable does not follow its move). When start pedaling, the RD completes full move, but the cable falls to get back its normal place on the holding slot. If so, the only solution is to put the cable back with some sort of tweezers or small screwdriver.

It happened to me a few times with Force 22 - road, on the repair stand. I noticed that the only way to avoid it is to never make multiple shifts at once toward the small cog, without pedaling.
Sorry for the late reply - this is exactly what's happening. I've taken the same approach to remedy the issue and won't do multiple shifts if I'm not pedaling at a decent rpm (even then I'm hesitant).
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