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Sluggish shifting on rear derailleur?

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Sluggish shifting on rear derailleur?

Old 03-03-18, 11:15 AM
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Explosive
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Sluggish shifting on rear derailleur?

So I watched the park took rear derailleur video a few times and got to tuning my drivetrain. Created slack at the barrel adjuster, got everything Big ring front small ring rear and tightened H screw until noise and slowly backed off until I got silent pedaling. Pulled slack out of cable and tightened cinch bolt.

Shifted up to second smallest rear cog(barrel adjuster is all the way clockwise) I then turn out the barrel adjuster until it made noise and slowly turned it back down until silent. I then worked my way up the cogs checking for noise and adjusting as needed. I wind up with some sluggish shifting down on the 2-4th biggest cogs but at this point Iíve removed all tension from the barrel adjuster.

The only thing I did adjust earlier was the B Screw, i tightened the gap slightly. Any tips here ?
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Old 03-03-18, 11:25 AM
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when are you requiring the gear change? you spinning * or climbing?

As Always I check the derailleur hanger alignment, it is the basis for index shifting function.

* (on the repair stand with no load is like spinning without much chain tension)






..

Last edited by fietsbob; 03-03-18 at 11:29 AM.
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Old 03-03-18, 11:30 AM
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Originally Posted by fietsbob View Post
when are you requiring the gear change? you spinning or climbing?

As Always I check the derailleur hanger alignment, it is the basis for index shifting function.

The bike is on a park tool stand, the bike was new in Septemberish so with some use things loosened a bit and so Iím doing a spring tune up in front and rear derailleurs. The hanger had worked loose and I tightened it back down. Iíll take a closer look but have no reason to suspect a bent hanger on this bike
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Old 03-03-18, 11:39 AM
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Park Shop tool, for the purpose, is more accurate than looking.. more 'speeds' the fussier is the need to not be out ..



(But..basically impossible to say, without seeing it in person..)


guessing will continue.. its cold there?







...

Last edited by fietsbob; 03-03-18 at 01:17 PM.
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Old 03-03-18, 11:47 AM
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I do actually have the dag tool after an issue with my hardtail bending the hanger. Iíll check it out and try again I guess
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Old 03-03-18, 12:36 PM
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Originally Posted by Explosive View Post
I wind up with some sluggish shifting down on the 2-4th biggest cogs but at this point
Referring to shifting "up" or "down" tends to be confusing. Are you shifting to smaller cogs when you have the problem or to larger? If smaller, then cable/housing friction is the #1 culprit. If up then sometimes a worn chain will develop excess side flex, slowing shifting.
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Old 03-03-18, 03:00 PM
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Shifting down as in from the 2nd largest down to the 4th largest (smaller)

I did tweak the hanger with the dag tool and it helped. It seemed to need the opposite cable tension adjustment I was expecting but hey itís shifting ok, could be s smidge smoother but Iíll work at fine tuning later I suppose. How much would messing with the b tension change shifting ?

It is cold here but the bikes not being ridden and itís stored inside
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Old 03-03-18, 03:08 PM
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Originally Posted by Explosive View Post
Shifting down as in from the 2nd largest down to the 4th largest (smaller)
Thanks for illustrating exactly why "up" and "down" don't work. When you go "down" to smaller cogs in the rear you are shifting "up" to a higher gear (ratio). When you do so on most derailleurs it is only the action of the derailleur spring pulling the cable through all of the housing that allows the shift to occur. Therefore if there's too much friction at any point the shifting will be sluggish in that direction. You mention alignment and b tension but don't indicate you checked the cable as I suggested above.
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Last edited by cny-bikeman; 03-03-18 at 03:12 PM.
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Old 03-03-18, 03:56 PM
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For Clarity.. count teeth quote the tooth numbers. of each..

It's what we did while you were (probably) prenatal...

Saying "I climbed that hill in my 42:26 gear"





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Old 03-03-18, 04:31 PM
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I haven't met the person yet who didn't momentarily pause in their pedaling (or hand cranking) at the moment they throw the shift lever. The shift will not take place until the pedaling resumes. Just for clarity, I for one would like the o.p. to define 'sluggish'. This is a 'new' bike by my definition. I was going to suggest shortening the chain by one link, but on a new bike that should NOT be necessary. Either a slight adjustment at the barrel adjuster fixes it or the problem is that there really is no problem at all. It also could be that the initial adjustments to the barrel adjuster were too extreme and the bike now needs to be taken to an LBS with good mechanics (they aren't all) to be adjusted properly.
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Old 03-03-18, 04:34 PM
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Originally Posted by Explosive View Post
It is cold here but the bikes not being ridden and itís stored inside
I think that's kind of his point: you need to either move to somewhere where it is possible to ride year round or learn to leave the bicycle completely alone in the off season. I kind of agree.
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Old 03-03-18, 09:15 PM
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Originally Posted by Leisesturm View Post
I think that's kind of his point: you need to either move to somewhere where it is possible to ride year round or learn to leave the bicycle completely alone in the off season. I kind of agree.
I guess I donít follow. Kind of tough to ride a bike with 700x28ís in 8Ē of snow. I was messing with it as the front cage was having some chain rub and I found the rear hanger came loose so I am going over the rear as well.
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Old 03-04-18, 12:45 AM
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Originally Posted by Explosive View Post
I guess I donít follow. Kind of tough to ride a bike with 700x28ís in 8Ē of snow. I was messing with it as the front cage was having some chain rub and I found the rear hanger came loose so I am going over the rear as well.
I was about as clear as it was possible to be without being unkind, or mean. Come on man, work with me here. Of course it's not possible to ride your bike in 8" of snow so what possible good can come from messing with it when you can't even take it around the block to see how much of a mess (or not) of things you've made?? Just leave the bike alone till Spring. Find some other winter sport to keep your mind off the bicycle. Or move to Portland or some other city where the winters are mild enough to ride year round. You never have to be off the bike except when its icy and that isn't very often. Clear now? I hope so.
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