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Rear Deraileur Dilemma

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Rear Deraileur Dilemma

Old 06-08-23, 04:17 AM
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Rear Deraileur Dilemma

I have a six speed cruiser bike for my wife, it shifted fine, got on it the other day and the jockey wheels started hitting the cogs. I tried tuning it to no avail, high/low/B screws had no effect. I even took a link out of the chain to see if that would help. Cables are new, wheel alignment OK, no bent hangar either. I've replaced and adjusted a few of these, and never run into this. Any ideas?

Thanks
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Old 06-08-23, 06:50 AM
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What derailleur? Was any type of service done, wheel removed, freewheel changed, etc?

There is a B screw, not B screws. What were you turning?
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Old 06-08-23, 08:18 AM
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Originally Posted by Kontact
What derailleur? Was any type of service done, wheel removed, freewheel changed, etc?

There is a B screw, not B screws. What were you turning?
He's lumped all the single screws together and called them plural. slow down.
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Old 06-08-23, 08:39 AM
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Originally Posted by Schweinhund
He's lumped all the single screws together and called them plural. slow down.
Evidently has more than one jockey wheel too that can hit multiple cogs at the same time!

But despite the smart-ass comments, I too will have to ask what else has been recently done to the bike as well as what specific RD are we talking about.

And since all the adjustment screws where moved, then really the OP needs to start back at square one and pretend they are doing an initial install of the RD.

Limit screws will never affect the jockey wheel touching the cog.
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Old 06-08-23, 08:50 AM
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Originally Posted by Iride01
But despite the smart-ass comments,
The only smart-assed comment was yours. Kontact obviously did not understand.
You on the other hand did. So keep it to yourself. Argue all you want to the mirror.
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Old 06-08-23, 08:53 AM
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I had a derailleur which i had disassembled and put back together. I put the back cage on upside down. It looked right when I did it. I couldn't figure out why the cage was hitting the larger sprockets. I tried everything but nothing worked till I discovered my mistake.
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Old 06-08-23, 10:49 AM
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A picture or two might help.
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Old 06-08-23, 10:57 AM
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A sort of common (at least here in the rust belt) is the B pivot becoming frozen in place, the der no longer moves freely as the cage spring and B pivot spring "work with" each other. Grime and water can enter the pivot and cause corrosion and/or too much friction resulting in that pivot binding. Removing the der and feeling how much effort is needed to rotate the mounting bolt (which is the B pivot "axle") will provide a lot of info.

I've overhauled this pivot on many, mostly Shimano, ders over the years. A simple job that is hard to do with only two hands and no bench vise. But this servicing has extended the life of many ders and costs less than replacing the der.

Not sure if this is what is going on with the OP's bike but worth learning about anyway. Andy
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Old 06-08-23, 02:48 PM
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Here's a shot of the set-up. The chain, freewheel, derailleur , cable and twist shifter have less than 25 miles of use. The odd thing is it worked perfectly smoothe and shifted great, parked it in my garage and the next day that dereilleur cage/top wheel was rubbing the cogs.. A bike shop replaced all of these components last year and it was working great. Thanks all for the input troubleshooting this.
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Old 06-08-23, 05:03 PM
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Originally Posted by FREEBIRD1
Here's a shot of the set-up. The chain, freewheel, derailleur , cable and twist shifter have less than 25 miles of use. The odd thing is it worked perfectly smoothe and shifted great, parked it in my garage and the next day that dereilleur cage/top wheel was rubbing the cogs.. A bike shop replaced all of these components last year and it was working great. Thanks all for the input troubleshooting this.
It is called cross chaining, the rear derailleur is on the largest cog and the front derailleur is on the largest chaining and that poor derailleur is being stretched to the limits. It is not a quality derailleur to begin with and it is just being further abused in that position which is probably causing the noise which it usually will. Teaching proper shifting will help. You never want to be in big/big or little/little
This may help: https://www.themanual.com/outdoors/h...ft-bike-gears/
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Old 06-08-23, 05:08 PM
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It only has a single chain ring in front (6 speed)
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Old 06-08-23, 05:11 PM
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Originally Posted by FREEBIRD1
Here's a shot of the set-up. The chain, freewheel, derailleur , cable and twist shifter have less than 25 miles of use. The odd thing is it worked perfectly smoothe and shifted great, parked it in my garage and the next day that dereilleur cage/top wheel was rubbing the cogs.. A bike shop replaced all of these components last year and it was working great. Thanks all for the input troubleshooting this.
The Tourney is a low-end RD which barely works at best with a MegaRange 34T and you are trying to ride the bike like it had a 1X groupset.

That new freewheel in the back should be a 28T or 30T, no more.
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Old 06-08-23, 05:23 PM
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It's not the Megarange set, it;s a 28T and the bike is just a 6 speed cruiser.
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Old 06-08-23, 05:31 PM
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Originally Posted by FREEBIRD1
A bike shop replaced all of these components last year and it was working great.
This is a very simple setup and there are loads of Park Tool videos to explain exactly how to re-install this from scratch.

My suggestion is to go back to the same local bike shop and they will make it working great again.
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Old 06-08-23, 05:31 PM
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Can you show us an image when the chain is in the smallest rear cog?

Now with VASTLY more info to see (that thousand word thing called a photo) I suspect the chain is way shorter than ideal. How did you determine the chain's length? Many cruiser type bikes have a fairly long chainstay and the common 114 to 116 links in a chain's packaging can often be just a few links too short for these bikes. Andy
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Old 06-08-23, 05:49 PM
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Thanks Andrew, I was thinking the same on the chain,I have a few extra sections I could add to test it, the shop actually installed it, along with the shifter,freewheel and derailleur. I'm surprised it worked as well as it did, if it is short? the bike shop is a hit-and-mis, sometimes you get good work, other times not so good.
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Old 06-08-23, 05:50 PM
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A bike shop shouldnít have let the bike leave like that.
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Old 06-08-23, 06:10 PM
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Originally Posted by smd4
A bike shop shouldnít have let the bike leave like that.
I've had a few bike shop disasters on new, and bikes I've brought for service ( a couple of them are still in my garage). I'm working on getting better at doing all this stuff myself, so I don't have to rely on them, the hourly rates are very high. This should have been an easy adjustment, I have done many of them, but I suspect they had original chains and that variable was not in the mix, hopefully a longer chain will get it going.
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Old 06-08-23, 08:48 PM
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With the chain on the largest Ring & Cog, you should be able to pull 1-2" of "slack".
Do you?
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Old 06-08-23, 08:50 PM
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Originally Posted by Bill Kapaun
With the chain on the largest Ring & Cog, you should have 1-2" of "slack".
Do you?
Seems Iíve seen this technique before. But canít remember when. Either way, this is a stupid technique. Avoid.
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Old 06-08-23, 09:21 PM
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Originally Posted by Andrew R Stewart
Can you show us an image when the chain is in the smallest rear cog?

Now with VASTLY more info to see (that thousand word thing called a photo) I suspect the chain is way shorter than ideal. How did you determine the chain's length? Many cruiser type bikes have a fairly long chainstay and the common 114 to 116 links in a chain's packaging can often be just a few links too short for these bikes. Andy
Thinking Andrew R Stewart Hit a home run.
Ever notice that most of the inexpensive cruisers use a common chainguard format? (hole position)
That chain stay, if that is correct with this bike, it is about an inch longer than the last huffy that I had to add links to a new chain to make it long enough.
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Old 06-09-23, 04:12 AM
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Originally Posted by Schweinhund
Thinking Andrew R Stewart Hit a home run.
Ever notice that most of the inexpensive cruisers use a common chainguard format? (hole position)
That chain stay, if that is correct with this bike, it is about an inch longer than the last huffy that I had to add links to a new chain to make it long enough.

The bike is a 30 yeat old Schwinn cruiser, it does seem to have a longer sweeping chain stay. I would still like to figure out why it worked so well with a short chain? did the spring in that derailleur all the sudden get weak sitting for a year? I have another one of theses cheap Shimano derailleurs on a gravel type bike that sees heavy use, works great, and has been around a few years.
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Old 06-09-23, 05:05 AM
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Originally Posted by FREEBIRD1
The bike is a 30 yeat old Schwinn cruiser, it does seem to have a longer sweeping chain stay. I would still like to figure out why it worked so well with a short chain?
Could be the simplest of solutions--maybe she never went into that gear until recently?

Last edited by smd4; 06-09-23 at 06:59 AM.
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Old 06-09-23, 08:15 AM
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Originally Posted by smd4
A picture or two might help.
Ya think ?

/markp
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Old 06-09-23, 08:31 AM
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Originally Posted by mpetry912
Ya think ?

/markp
Yes. Yes I do.
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