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Trouble With Syncro Shifters (Loosening Up)

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Trouble With Syncro Shifters (Loosening Up)

Old 06-16-15, 09:12 AM
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Trouble With Syncro Shifters (Loosening Up)

So the Campy Syncros on my bike tend to "loosen up" after a bunch of shifts. This happens on both the FD and RD shifters.

The result on the FD side, after about 15 minutes of riding, is a big-ring shift that won't "hold", as the shifter will flop back halfway to resting after the shift. On the RD side, it causes the chain to jump to a harder gear if I put force on the pedals (particularly annoying when climbing in an easy gear).

Every so often I while riding I'll reach down and tighten the shifter bolts but I can't get them tight enough to hold (feel like I'm going to break the "wishbone" on the shifter bolt if I try to tighten it like crazy).


I've heard it could be the washer configuration within the shifter, could this be the case? I took the shifters from another bike, took them apart and then installed on this one, so it is a possibility that they're wrong.

Otherwise, is LockTite the answer here? There's no LockTite currently on the bolt. If so, what type of LockTite is best?
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Old 06-16-15, 11:09 AM
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I would only use loctite as a last resort, and if so, you will want the Blue (I think); the one that is removable.

A quick Google search on "campy syncro shifter exploded diagram" brought up a number of pics showing part order.
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Old 06-16-15, 12:48 PM
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Triple check the washer position. Is the front shifter friction or retrofrition?

Which Syncro shifter do you have the one with the lever or the one with the big knurled ring?

If you can find a bottoming 5m tap (10-32 English I believe) and run it down the bosses that might help.

I would try an extra small washer just under the head of the bolt.
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Old 06-16-15, 12:49 PM
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This has been a fairly common problem on Synchro-equipped bikes I have worked on.

Perhaps more than 50% of the bikes work properly, but I have struggled with Synchros on too many bikes, usually removing and re-installing the shifter assembly perhaps 20 times in an effort to find the exact cause.

There is a small washer that appears to allow the thumb screw to bottom out hard and thus remain tight, but for some reason I often can't get these levers to hold, and resort to the Loctite as time runs out on a repair.

So, a lot of time I've wasted with my drawer of little washers at hand, trying to get a secure lever. What is most annoying is Campagnolo's completely un-intuitive approach to design function in this area, so a continual head scratcher for me.

Still, for the many Synchro setups that have worked properly, I can at least intermittently forgive the ones that aren't quite right, if only because my memory lapses...

For me, I keep the Synchro clicker well-lubed, and use modern, narrower chain wherever I can. They can work very well.
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Old 06-17-15, 02:51 PM
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Thanks for the help everyone. I'll check the washers first and go from there.
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