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Rear cassette chain rub

Old 07-29-18, 11:28 PM
  #1  
SethB
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Rear cassette chain rub

So, to the point, the rear derailleur, no matter what I do, always sits a bit too close to the tire.

This causes the chain to rub on the next bigger chain ring no matter the gear (except the biggest for obvious reasons).

I have completely taken apart the derailleur and readjust my cable and cable adjust screw at the shifter. Nothing worked. Its almost like the spring isn't strong enough to pull the derailleur away from the tire. However, this can't be right if it does it in all the gears.

So, I though, hey the hanger prolly is bent. But, I never dropped it or crashed or anything major that could have bent it. Not to mention, it looks like a beastly hanger. The thing is about a cm thick.

Is the problem probably the hanger? Would the LBS be able to straighten it or is that pricey?

Could it be something else? Chain length? Idk...

Not only is it noisy, but over bumps and jump landings it tends to shift quickly then drop back to the proper gear. Shifting is perfectly fine though. One click of up or down moves me one chain ring up or down.

I'm thinking somehow hanger got bent.. You guys will probably hate me for this idea, but can I bend it back with pliers/vice grips? I would add a rag or something to protect it.

Thanks guys, this is the only issue with my bike and its quite annoying xD
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Old 07-31-18, 07:48 AM
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You've given no indication of the type of bike ? how is the RD near the tire ?

A few decent photos, will go a long way in showing the problem, & hoping then people can give you an answer.
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Old 08-01-18, 08:30 AM
  #3  
SethB
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Originally Posted by Bike tinker man View Post
You've given no indication of the type of bike ? how is the RD near the tire ?

A few decent photos, will go a long way in showing the problem, & hoping then people can give you an answer.
Thanks for the reply. Bike details are in my info on the left. I should have specified that. But its a 2014 Trek Fuel Ex 5 29er

RD isn't near the tire at all. like it clears it no problem even in the biggest cog.

Here's a photo


You can see the chain is touching the cog to the left. The next bigger cog.
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Old 08-01-18, 09:26 AM
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Unfortunately, that photo is taken from too close to get a decent perspective on the derailleur cage to see if it is straight. Shift the chain onto the 3rd smallest cog and take a picture from directly behind the derailleur taken from a distance where you can see both the cassette and the whole derailleur. In the picture so far provided, the derailleur cage appears to be bent outwards, but that could be a trick of perspective in this very close photo
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Old 08-01-18, 09:30 AM
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8 speed chain on 10 speed cassette?
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Old 08-01-18, 09:34 AM
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Looks to me like a pretty standard cable adjustment, plus maybe B screw and high stop. You don't want to be bending your hanger unless you're damned sure that's the problem.
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Old 08-01-18, 09:38 AM
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Originally Posted by woodcraft View Post
8 speed chain on 10 speed cassette?
That's what it look like.
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Old 08-02-18, 04:20 AM
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Yes, photograph is a help but really too close up:

1st thing look at the links on the chain it should state the manufacturer & model # etc, look it up on the web, & see if the chain is correct for the rear cassette, as mentioned above it could be one of several bad combinations. Even some group sets the chain is specific to that group set.

Another thing to check is the chain touching the next cassette gear on both the top & lower of the gear, that will help indicate if the RD arm is bent in or out.

When checking the RD arm to see if its straight, make sure you are on a set of gears that allows the RD arm to be 90' to the ground, not doubled back on its self or pulled forward on the large - large chain ring & lowest cassette ring (nearest spokes)

It could be the RD hanger on the end of the chain stay is slightly bent.
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Old 08-02-18, 05:28 AM
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EDIT -- I see you mentioned it's a Trek 2014 Fuel EX 5 29. The specs show a 10-speed Sram PG-1030, in 11-36. And a Sram X5 derailleur.
What's stamped on the chain links?

The bike shop has a tool to check and adjust the dropout alignment. It's probably an inexpensive procedure. Call and ask.


Originally Posted by SethB View Post
So, to the point, the rear derailleur, no matter what I do, always sits a bit too close to the wheel.

This causes the chain to rub on the next bigger sprocket no matter the gear (except the biggest for obvious reasons).

...snip...
(quoted edited to the correct terms.)

Yes, it looks like the wrong chain for this bike. Is there an ID stamped on the chain links? How many speed cassette, is it 9 speed?

I cropped your photo.
See the highlighted teeth in pink, there's no gap at all, either next to the chain plates or the teeth in the rollers.

Perhaps it's just the slight angle to the camera, and close-up distortion. But this is your complaint, that it rubs.


compare to this photo of an 11 speed cassette, teeth in pink. There's a gap between the chain and the next larger sprocket.


Last edited by rm -rf; 08-02-18 at 05:49 AM.
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Old 08-04-18, 10:22 PM
  #10  
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To everyone saying its an 8 speed chain on a 10 speed cassette.. the wallet told me it was a good idea.. xD

I knew being cheap would bite me.. I bought an 8 speed chain at walmart....... please don't yell at me as I already hate myself :/

So, I took the pics of it a bit further away. Here they are:




I'm not sure if it looks bent or not. If I had to say, I don't think it does. But you guys are the pros. I will admit I did try bending it a little, but I bent it back cause it didn't change anything.

I think the problem IS because I put the wrong chain on. I thought I could save some money but I ended up costing me more.

Now, onto fixing the chain type:

Which chain is "best". I live in Florida and the reason I needed a new one was because the old one got really rusty from being out in the rain while I am in class.
I saw the TiNitride Gold from KMC and it has good reviews on Amazon plus a site I read reviewed it and it seems what I need.

Thanks all, and sorry for making the mistake of buying the wrong chain and complaining here xD
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Old 08-04-18, 10:45 PM
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Yeah, that'll never work. An 8 speed chain is wider than a 10 speed. Leaving the bike in the rain is going to hard on it. I'd advise you to get a cheap bike to use as a commuter--really, a FS trail bike to bike to class? Using a good, thick, oil based lubricant frequently will do more to prevent rust than any chain surface treatment. That said, yeah, look for something with some surface treatment. Shimano HG95 is pretty good, that KMC chain would be fine, etc.

Also modern mountain bike drivetrains are fairly sensitive to hanger alignment. This is something to do with a precision tool and not by eye. Take it to a shop to get sorted out. This is like a five to ten minute job for a good mechanic and the cost of straightening it (and probably adjusting the derailleur) should reflect it.
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Old 08-05-18, 08:19 AM
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Originally Posted by cpach View Post
...really, a FS trail bike to bike to class?...
Yes. I just don't have the funds for another bike. And tbh, my friends all have cheap bikes from like walmart and I swear I am fixing their bikes more than riding my own - not because fixing their bikes takes time away from me riding. Its just a cheap bike in Fl just doesn't hold up. Plus I already had my FS trail bike that I used in PA so it works. I lock it securely and never had any problems for the 2 years I have been here. Not to mention, there just isn't any space for a second bike in my dorm room. For me, using my bike to get around to class works. I could have avoided all this if I would have just lubed the chain when I was supposed to. I did an every two week lube and it was perfectly fine. I just got lazy last semester and now I am paying the price, as well as paying the price of being stupid with bending the hanger and using an 8 speed chain.



Originally Posted by cpach View Post
Also modern mountain bike drivetrains are fairly sensitive to hanger alignment. This is something to do with a precision tool and not by eye. Take it to a shop to get sorted out. This is like a five to ten minute job for a good mechanic and the cost of straightening it (and probably adjusting the derailleur) should reflect it.
Thanks. This is what I'll be doing today! We have a really good one here. I love them to bits. They are awesome.

Thank you for your help man. I appreciate it
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Old 08-05-18, 10:48 AM
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Originally Posted by trailangel View Post
That's what it look like.
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