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#1
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Chain skipping issue
Just built up a new frame with Campy 11 drive train. Took it out last night for a shakedown ride and it wasn't pretty.
Chain kept skipping in cogs 8-10 (ordered low to high tooth count) or so. By skipping I mean shifting to the desired cog, but once in cog n (the desired cog), it would try to get to n+1 with the outside of the chain right on top of the next cogs teeth, but then drop back down to n, creating an unsettling thunk. This would happen every few pedal strokes. Now normally I would just adjust the RD to reduce the cable tension, but there was no adjustment that would resolve this. I could pull the cable with my hand and get it to track properly, but there was no way to shift it into that position. Initially it was a new chain with an old cassette, so I replaced the cassette, but it still showed this anomaly. I checked the chain for frozen links, but didn't find any. The wheel was firmly seated in the drop outs. I did notice that the chain (which had to be installed by REI mechanic due to not having an 11 speed tool) was probably longer than I would have made it. In the small chainring, smallest 2 cogs, the chain is rubbing the bottom of the derailleur jockey wheels. The derailleur hanger looks straight as does the derailleur itself. I'm out of ideas. Help would be appreciated. |
#2
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REI should have no problem removing a few links for you. Start with 2 links, ride it around the lot and see if everything shifts correctly. It happens to me with new builds when I don't have the old chain to go off of, it's easier to downsize the chain than to up size.
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#3
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have you routed the cable correctly through the derailleur? Is it possible that the cable is catching somewhere? Is the cable tightly fastened? Strange issue. Hopefully the shorter chain sorts you out.
I had something similar happening and it turned out that the wheel builder had built the wheel too far to one side so when in the larger sprockets and under heavy power it would want to jump right out of the gear. Don't think this applies for you but just encouraging you to think outside of the box! ...it IS an 11spd campy chain, right? Last edited by Pierre; 07-18-2017 at 09:00 AM. |
#4
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Simple things first - make sure cable is running freely at bottom bracket guide.
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#5
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Double check alignment of derailleur hanger with alignment gauge and also if that all bolts hanger and main derailleur bolt are tight.. Fixed a friend's bike that had loose bolts....
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#6
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2015 Campagnolo Revolution?
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#7
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-Der Inner wire routed properly on rear der...under fixing bolt, plate. -Shifters and rear der compatible. -Wee brass washers not turned sideways, the ones that the der housing pushes against in the lever. -Tool to check der hanger. -Rear der cage on correctly(not upside down) and both pulleys in proper place, upper and lower. -IF you shorten the chain, DO NOT just push a pin out and install a new pin=broken chain. Use a proper snap-link(KMC, I rec.). -Ya SURE no tight link? Sure sounds like one.
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Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#8
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Derailleur wire is routed properly No ferrules in lever Cage on correctly, taken from another bike that was shifting fine Definitely no tight link, but the rivet that was peened, feels like it might be on the high side, not sure. It doesn't catch at that rivet each time, but does occasionally. Housing is the correct length and it feels like the cable is moving freely, but I do recall a time where the tension in the run from the shifter to the BB felt different than that between the BB and the RD. The cable is being run through a short section of tubing at the BB. |
#9
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Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#10
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A new Richard Sachs.
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#11
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I'd still check the der hanger..does it have a bolt on under BB guide? Any way to add one if t doesn't? Many index systems don't like inner wires running on metal. And if the little tube you added is moving with the der cable as you shift.
__________________
Chisholm's Custom Wheels Qui Si Parla Campagnolo |
#12
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Figures Lol... hope you get it worked out my friend Sent from my iPhone using Tapatalk |
#13
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Thanks for the great feedback, will be going with the snap link approach, but the main problem for those who may unearth this thread in the future was too much friction in RD housing, which was odd because it was right out of the box.
Anyway thanks for the assistance. Will be posting pics of the frame soon, its pretty gorgeous. |
#14
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Quote:
I find White Lightning (the wax lube) to be absolutely amazing for cables in lined housing. I get 1.1mm gear cable running through normal (for 1.2mm) liners. It feels like I forget to put the cable in. I lent a friend a spare set of (new) Ergolevers and in the process of installation actually asked him if he forgot to put the cable through. He hadn't. |
#15
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