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Bike keeps breaking - rear derailer...

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Bike keeps breaking - rear derailer...

Old 06-09-05, 05:39 PM
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Binda
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Bike keeps breaking - rear derailer...

Bike: Fisher Wahoo
Bought less than 2 months ago - less than 25 rides on it. Has already had it's 30-day tuneup.

About 2 weeks ago I was on a ride, and my chain started sounding funny when pedaling up steeper hills - got to the top, pedaled hard once, and the chain went loose. Upon inspection, the top cog on the jockey cage was loose, because the bolt had come undone. I was missing the washer for one side, so some friends helped me and I rode home w/out shifting and w/that cog completely off. I brought it in to the bikeshop, and they quickly fixed it (put on a new washer, and put everything back together). I thought everything was fine, until tonight the same thing happened, except this time the bottom cog on the jockey wheel broke (same thing - bolt didn't hold, and it all poped apart, sending the outside washer flying). Thankfully I was riding on pavement at the time and heard the little 'ping' sound of the washer flying off. I stopped and found it, and also thankfully brought along allen wrenches this time. I put it all back together, but it just doesn't sound quite right, nor shift quite right. I can hear some rubbing sounds.

What is the deal? Is the shop just doing crap work, or am I pedaling wrong, or shifting wrong, or too heavy for the bike (just over 200 lbs), or is it just a crap derailer?

I'm getting really frustrated that things are breaking so often. I don't really consider the trails I'm riding to be difficult, although there are lots of roots that I have to ride over (chain bounces quite a bit).

I feel like an a$$ bringing it to the shop again, since it's been in three times since I bought it (tuneup, sheared brake cable, and the first jockey cage break).

Makes me either want a new bike, or switch to singlespeed....

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Old 06-09-05, 06:28 PM
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Bikewer
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More information, please. What type of bike, what type of derailleur, and so forth. I have been cycling for many years, and have never seen failures of this type. I'm assuming the DR is defective, damaged, or badly installed.
Or, the chain might be severely underlubed or badly kinked or somesuch.
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Old 06-09-05, 06:39 PM
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I'm gonna' guess it's a Fisher Wahoo, with an Alivio RD

I'm a little lost in the terminology here: "top cog on the jockey cage" ?? What does that mean? Do you mean that your jockey pulleys came apart? The bolts that hold the jockey pulley inside the rear derailleur came out??

https://checkout.dotserv.com/cykeltu...ges/Pulley.jpg

http://www.parktool.com/images/TTOL/chain-tightlink.jpg

If this is what you mean, it's a shoddy job of assembly, but an easy fix.

The other problem is: 25 miles on your bike in the first 30 days? Should have been more
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Old 06-09-05, 06:40 PM
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Binda
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I put the link to the bike in the top of the first message. Here it is again (everything on it is stock).

http://www.fisherbikes.com/bikes/ful...sis&bike=Wahoo

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Old 06-09-05, 06:46 PM
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Gee Neil, you're smart. Couldn't have been the link I posted in the first message that gave it away, could it? Here is the link again: (everything on it is stock).

http://www.fisherbikes.com/bikes/ful...sis&bike=Wahoo

Yes, I guess the jockey pulleys came apart (sorry for the bad terminology). On both of them, the bolts have come undone and it all fell to hell. I don't know if the chain has kinked like in the second picture you posted - not that I have seen.

Reread my first post, smart alec - 25 rides, not miles. so maybe just under 200 miles? (still not enough, but oh well).

So, what is this quick fix? And how was it put together shoddily? Should I bring it to another shop? (labor is free for one year at the shop I bought it from).

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Old 06-09-05, 06:56 PM
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Originally Posted by Binda
Yes, I guess the jockey pulleys came apart (sorry for the bad terminology). On both of them, the bolts have come undone and it all fell to hell. I don't know if the chain has kinked like in the second picture you posted - not that I have seen.
The jockey pulley bolts should be torqued to 27-34 inch-pounds. That's just snug, if you don't have a torque wrench. Not a bad idea to use blue Loctite when reassembling:

http://www.brocktoncycle.com/catalog...facturerCode=0

Reread my first post, smart alec - 25 rides, not miles. so maybe just under 200 miles? (still not enough, but oh well).
Sorry

So, what is this quick fix? And how was it put together shoddily? Should I bring it to another shop? (labor is free for one year at the shop I bought it from).
Odds are that the LBS who built this bike for you didn't have to assemble the rear derailleur. Likely, they just attached it. Maybe the could have/should have checked to ensure it was properly torqued. Maybe not. Too few facts for the blame game.

I'd ensure that a threadlocker is used on the bolts (one like the Loctite, that allows removal with hand tools), and that the bolts are appropriately torqued on replacement.

Then, just keep an eye on 'em while you're looking around your bike.
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Old 06-09-05, 08:07 PM
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Is there any way I could be shifting wrong, or cleaning the chain wrong? I've used suggestions found on this site for cleaning the chain, and I'm fairly sure I lube it up enough after cleaning it....

Thanks for all the help so far.

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Old 06-09-05, 09:45 PM
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The failures have nothing to do with you. the derailler was not correctly assembled at the factory. If you have all the parts, you can simply tighten the bolt and it will probably not give you any trouble. If not, then take it back to the shop again and let them fix it. It's hard to believe they didn't check the lower pulley when you had upper pulley problems, but who knows.

The shop that sold you the bike is responsible to give you warranty service. You might suggest they check for stripped threads on the pulley cage. Maybe you should also suggest they warranty the whole derailler. After all, this is the second time in under 50 miles you have had this kind of problem with it.
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Old 06-10-05, 02:24 AM
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If you hear strange noises coming from your bike then stop and investigate, don't just ride on.
I've spent many happy hours combing through grass and sand for small bolts and bits that fell off.
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Old 06-10-05, 05:17 AM
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The bolts that hold the cage together as well as the going thru the jockey wheels are assembeled at the Shimano factory and are installed on the bike during the assembelly by the importers assembeller in Taiwan or China. My guess is the the bolts were not properly installed. All these I have taken apart have a thread blocker like LocTite although there is a white threadblocker that seems to be popular in Asia assembelly lines these days. Demand the shop put a new deraileur on. I'd put an upgraded one on if you bought the bike from me and had all these problems in such a short time. Say a Deore, if it was Alivio.

Shops that follow the Chris Zane LBS model make no issues of problems like this. They simply have a technician replace the deraileur with a new one and don't even mess with the broken one. Chris Zane is one of the most successful shop owners in the world, his success is based on customer good will and never causing a stir over a few bucks worth of hardware. "Wow an new deraileur and so fast, I'm comming back here for my boyfriends birthday present" is what you want to hear!

Jude, Wheel Doctor Cycle and Sports, INC
St.Michaels, Maryland
1-800-586-6645

Last edited by Wheel Doctor; 06-10-05 at 05:24 AM.
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Old 06-10-05, 05:44 AM
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Originally Posted by MichaelW
If you hear strange noises coming from your bike then stop and investigate, don't just ride on.
I've spent many happy hours combing through grass and sand for small bolts and bits that fell off.
Ain't that the truth....


Anyway, I've had that type of problem with the derailleur pulleys.
Usually didn't find the parts that flew off.
Blue Loc-tite solved the problem.
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