Bicycle Mechanics - Shifting Problem
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For the last couple of rides I have had a problem downshifting into the middle cog on my 10-speed Ultegra cassette. I run a standard 12-25 cassette and keep it well lubed. It's only the middle cog and only when downshifting a single gear. If I do a 2-gear jump it works, but always hangs on a single. I've got the RD dialed in as but can't figure this out.
08-25-08, 08:48 AM
08-25-08, 09:15 AM
^^^^ A bike shop can fix this in ten minutes, once they get to it. You can learn to do it yourself. Literally every bicycle on the road periodically requires this kind of adjustment.
G piny parnas
08-25-08, 11:40 AM
:rolleyes:your shifters could be sticky--- a crushed cable guide or casing--- the housing (gears) could need replacing--- clean and lube.......pull the cable with your hand and feel the progression
08-25-08, 12:57 PM
This is usually caused by the cable sticking in the loop which leads down to the RD. Try some wd40 inside the cable and change the rear gears up and down the range. When the cable becomes free, oil the cable. To do the job properly of course you could dismantle the cable and outer, use WD40 to clean the outer, re-grease the cable, re-assemble and adjust the gears.
Rock ' n Roll cable magic is supposed to work wonders for this. Apply liberally at entry points and twirl your bike around and voila! (supposedly)
G piny parnas
08-25-08, 04:49 PM
wd 40 is not the wonder for cables and housing--- the plastic guide inside the housing melts--- it takes dirt with it down the guide and basically is only an emergency fix--- replace the housing with fresh plastic inserts--- shimano or campi --- the good stuff and a little phil grease--- works for me......
G piny parnas
08-25-08, 04:54 PM
to add--- unless the cable is rusty--- you need only mess with the casing and adjustment of slack--- cheap housing is cheap, sometimes all the housing can be dis-assembled while leaving the der connection--- bike shops get away with tune and cleans this way--- I would take the whole thing apart and learn ----
But don't take the shifter apart.
08-25-08, 06:30 PM
If the problem hits while downshifting,, It is probably not just the cable since you are pulling the cable under a load from the shifter and it is a direct movement. If the cable was sticking, it would hesitate or not shift when shifting up. I had a similar problem with a campy 10 speed. I could hit every gear but it skipped back and forth on the center two gears. I had to re-time the entire cassette including opening up the limit screws. It was happening because the shifters were one detent off the way we had the timing set.
Try to reset your derailleur from the beginning and see if you can hit all the gears.
08-25-08, 07:46 PM
^^^^ A bike shop can fix this in ten minutes, once they get to it. You can learn to do it yourself. Literally every bicycle on the road periodically requires this kind of adjustment.Were you referring to capwater's answer (cables)? If otherwise, please describe.
I was at the Hotter N Hell this past weekend and took my bike to the Shimano support truck for them to look at it. They only spent a couple of minutes with it since there were a million people there but the Shimano wrench was at a loss. Since both the chain and cables are new, I'm starting to wonder if there is a defect in the shifter. Has anyone had any problems with 10-speed Ultegra shifters like this?
08-26-08, 12:01 PM
For the last couple of rides I have had a problem downshifting into the middle cog on my 10-speed Ultegra cassette. I run a standard 12-25 cassette and keep it well lubed. It's only the middle cog and only when downshifting a single gear. If I do a 2-gear jump it works, but always hangs on a single. I've got the RD dialed in as but can't figure this out.What do you mean by "downshifting"? Moving from larger cogs to smaller cogs? If that's the issue, then it's definitely cable-friction of some sort.
What do you mean by "downshifting"? Moving from larger cogs to smaller cogs? If that's the issue, then it's definitely cable-friction of some sort.
No, moving from smaller to larger cogs.
08-26-08, 12:17 PM
What levers, RD, #speeds, etc? It could be an adjustment and it could also be a case of mismatched parts.
I have Ultegra 10 speed levers, Ultegra RD, a 105 12/25 cassette, and a 53/39 chainring.
I have also tried my other wheel which has a dura ace 11/21 cassette and it has the same problem in the same spot.
So I've tried everything I can think of. New chain, cables, different wheel, even let my brother ride it. Same thing. I've decided to just send in the shifter and let Shimano warranty it. I sure hope this solves the problem.
Maybe slightly bent hanger? I had the same exact problem on a MTB.
Have you dropped your bike or put pressure on the RD/hanger lately? A LBS should be bale to do some magic and tell you if it is bent and then unbend it, if that is the problem.
I had my LBS check the hanger and they said it was spot on. This bike has been babied since day one. I had one guy tell me to just suck it up since it was only one gear that keeps missing, but to me it's akin to not being able to shift into third gear on your car.
So my LBS has had my bike for the last week and called me to say they had the problem fixed. They replaced the cables (again), replaced the derailleur hanger, and lubed every moving part. I took it out last night on a different wheel and it's still skipping in the same place when i downshift. Please help.
Well you could try shooting the shifter full of WD40, but if you plan to send it to Shimano don't do that.
Plan B would be to return it to Shimano going through the dealer that sold you the shifter.
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