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chain rubbing against small chainring, roadbike

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chain rubbing against small chainring, roadbike

Old 05-21-16, 03:48 AM
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tylerj
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chain rubbing against large chainring when in small-small, roadbike

Hi Gang, I did a little searching on this issue but could only find info about the chain rubbing on the front derailer... my issue is a bit different. Hopefully someone has come across this!

The Bike: Cervelo S1, Ultergra 6600 groupset with FSA Gossamer crank

The Issue: If I switch into my smallest sprocket on the cassette, and smallest chainring, the chain rubs on the large chainring. As soon as I go to the next nargest sprocket the rubbing goes away. I should note that this only started after taking the chainrings off to do a thorough cleaning. In the past it hasn't been an issue taking them off and putting them back on, but perhaps I over-tightened them or something? Figure I should check in the mechanics on here before taking things apart in case it's a common issue.

Thanks in advance!
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Old 05-21-16, 04:19 AM
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frankenmike 
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Not unusual for a cross chained gear selection to rub a little. No need to do anything, just don't use that gear combination.
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Old 05-21-16, 04:37 AM
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Originally Posted by tylerj View Post
I should note that this only started after taking the chainrings off to do a thorough cleaning.

Maybe you just noticed it after doing that or the sound changed a little bit based on lubrication so that made you notice it. Mine starts to make noise in the large front and second largest rear...on the largest rear and large front, it rubs pretty good...always has...the noise does change a little depending on conditions like humidity, lubrication, etc.
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Old 05-21-16, 09:09 AM
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I assume you checked that you have the chainrings aligned with the crank arm and right side around?
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Old 05-21-16, 09:16 AM
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Yep, no good reason to use that combo anyway.
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Old 05-21-16, 09:55 AM
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This is very typical and one of my road bikes it does this too. I have even seen this happen when on the second smallest rear cog for some bikes, product of short chain stays. Normally not a problem. I cross chain the big-big combo all the time but never use the small-small no need for this.
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Old 05-21-16, 10:22 AM
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Originally Posted by tylerj View Post
Hi Gang, I did a little searching on this issue but could only find info about the chain rubbing on the front derailer... my issue is a bit different. Hopefully someone has come across this!

The Bike: Cervelo S1, Ultergra 6600 groupset with FSA Gossamer crank

The Issue: If I switch into my smallest sprocket on the cassette, and smallest chainring, the chain rubs on the large chainring. As soon as I go to the next nargest sprocket the rubbing goes away. I should note that this only started after taking the chainrings off to do a thorough cleaning. In the past it hasn't been an issue taking them off and putting them back on, but perhaps I over-tightened them or something? Figure I should check in the mechanics on here before taking things apart in case it's a common issue.

Thanks in advance!
This absolutely will happen in the small-small, especially with a bike that has chainstays as short as an S1. What is weird is that you didn't notice it before.

Also, it's kind of overkill to take chainrings off to clean them. A rag and a toothbrush is usually sufficient.
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Old 05-21-16, 08:13 PM
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Originally Posted by caloso View Post
Also, it's kind of overkill to take chainrings off to clean them. A rag and a toothbrush is usually sufficient.
These might be helpful: Finish Line - Bicycle Lubricants and Care Products - Gear Floss? Microfiber Rope
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Old 05-21-16, 08:20 PM
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Originally Posted by caloso View Post
This absolutely will happen in the small-small, especially with a bike that has chainstays as short as an S1.
+1 this. And especially if there is a large difference in tooth count between the inner and outer rings.
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