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Takes two index clicks to shift to smaller cogs on rear cassette

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Takes two index clicks to shift to smaller cogs on rear cassette

Old 01-07-10, 07:13 PM
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Andy Somnifac
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Takes two index clicks to shift to smaller cogs on rear cassette

I have an Ultegra 10 speed group on my bike, and am having some issues shifting.

What works just fine:
  • Shifting from smallest cog, all the way to the largest in 1 or 2 index click increments, exactly as it should.
  • Shifting from a larger cog to a smaller cog, assuming I don't shift to larger than the 4th smallest cog or so, with a single index click.

However, if I go beyond the 4th cog, it will take 2 index clicks to begin to shift back towards the smallest cog.

Example:

If I shift all the way to the largest cog with 9 index clicks from the smallest (exactly as it should be), it will take me 2 index clicks to get it to move from the largest to the next cog. If I give it one more index click, it will move one more cog. At some point it will jump a cog (usually the 2nd or 3rd smallest) so that the final index click puts it back at the smallest cog.

This is definitely driving me crazy. Anyone have any ideas?
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Old 01-07-10, 07:22 PM
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Al1943
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Probably some excess friction somewhere along the cable. This is most often found in the short housing just before the rear derailleur.
Solution is to replace or lubricate the shift cables and housings.
Another possibility is hardened grease or dirt in the shifter.
Solution is to hose out the shifter with WD40.

You could try reducing the tension on the rear shift cable but that may cause other problems.

Al
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Old 01-07-10, 07:23 PM
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Originally Posted by Andy Somnifac View Post
  • Shifting from smallest cog, all the way to the largest in 1 or 2 index click increments, exactly as it should.
  • Shifting from a larger cog to a smaller cog, assuming I don't shift to larger than the 4th smallest cog or so, with a single index click.
Er what? you mean the number of clicks between gears is Not Consistent?

Is it a grip shifter? rapid fire shifter? indexed lever?




Just get a friction shifter and forget about it...
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Old 01-07-10, 07:56 PM
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You may want to disconnect the cable and reset.
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Old 01-07-10, 09:03 PM
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Originally Posted by xenologer View Post
Is it a grip shifter? rapid fire shifter? indexed lever?

Just get a friction shifter and forget about it...
LOL. Sif.

It won't be your shifter; I wouldn't advise dousing it in WD40 just yet...

It's just a case of more friction in your cable than the derailleur's return spring can overcome. You can verify this by turning the bike upside down or putting it on a stand and shifting through the gears while assisting the derailleur's return action.

I find it it a bit annoying how weak this spring is; I'd be happy to put up with a bit more shifting effort to enjoy a far less fussy system... some Shimano derailleurs used to have a preload adjustment on that spring, but it's fairly rare...

And if it was possible to actually get the parallelogram apart, you could tweak it as strong as you liked, but no go there...

Given you have Ultegra, I'm assuming you have quality cables, so before replacing your rear one and using the old one for the front, I'd make sure it's not kinked, clean and lubricated, and your housings are the right length to minimise bends.
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Old 01-07-10, 09:24 PM
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dirty cables. you riding in harsh conditions?
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Old 01-07-10, 09:30 PM
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I have Gore Ride On cables. It seems that the inner housing has pulled slightly into the outer housing and was causing some friction. It looks like I'll have to cut a hair off the rear cable housing to prevent this from happening again.
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Old 01-07-10, 11:07 PM
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Originally Posted by Al1943 View Post
Probably some excess friction somewhere along the cable. This is most often found in the short housing just before the rear derailleur.
Solution is to replace or lubricate the shift cables and housings.
Another possibility is hardened grease or dirt in the shifter.
Solution is to hose out the shifter with WD40.
You could try reducing the tension on the rear shift cable but that may cause other problems.

Al
Just to add it this, many times the stock rear housing loop is too short. Adding a couple centimeters to the rear housing loop can decrease friction.
I find that adjusting the high limit screw so the derailleur rests a couple a mm or two just outside the center of the small cog, then using the derailleurs cable adjuster to add a bit of tension works better than setting the limit screw to the absolute center of the small cog.
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Old 01-08-10, 12:31 AM
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Originally Posted by vredstein View Post
I find that adjusting the high limit screw so the derailleur rests a couple a mm or two just outside the center of the small cog, then using the derailleurs cable adjuster to add a bit of tension works better than setting the limit screw to the absolute center of the small cog.
Nice tip, but some shifters allow extra slack for the last cog, so I'd advise checking it doesn't allow the RD to move too far.
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Old 01-08-10, 12:51 AM
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Originally Posted by Kimmo View Post
Nice tip, but some shifters allow extra slack for the last cog, so I'd advise checking it doesn't allow the RD to move too far.
Definitely. Sluggish high cogs are livable, but a jammed chain is a potential disaster.
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Old 01-08-10, 01:35 AM
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Also check if the cassette is tight, if the derailleurhanger (dropout) is straight and if the wheel is installed straight.
And offcourse check the cable and housing for increased resistance.
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Old 01-08-10, 10:50 AM
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First, adjust the rear der cable tension. 99% of shifting problems are just cable tension adjustments.

If the cable tension is good, shift down to your smallest cog in the back. Take out the rear wheel and pull the shift cable by hand. The der should move smoothly and easily back and forth as you pull on the cable. If there is any binding, release the cable and push on the der by hand to make sure the der itself is not binding. If the der is ok, replace the cable and all the cable housing.

If after replacing the cable and housing, there is still a shift problem, then douse the shifter with WD40.
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Old 01-08-10, 10:57 AM
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Everyone,

Thanks for all the input. The issue was in the rear cable/housing. The inner liner of the Ride On cable system pulled itself slightly back into the outer cable housing. This was causing the cable to bind up slightly when shifting down the cassette.
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