Chain occasionally getting stuck between rings.

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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Juanmoretime
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by Juanmoretime

I have a FSA Gossamer crank on my cross bike. Twice now the chain has got stuck between the rings when shifting from the big to the small ring. I'm pretty sure it only happens when I'm in the smaller cogs in the back. Anybody have this issue or better yet a solution? Different rings, chain or both?
RESIDENT GRUMPY OLD MAN.

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Max Gravity
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by Max Gravity

Happens when you have 8sp rings with 10 speed chain or 9 speed rings and 11 speed chain or similar.
I know that from experience.
Make sure you have 10 or 11 speed rings to start with.
I think the crank standard is unchanged (thickness wise) but I'm not sure, just an observation on Campa cranks.

edit: Come to think of it; Campa used a small shim behind the rings on the bolt behind the crankarm to compensate for thinner rings once.
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by Weenie


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Juanmoretime
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by Juanmoretime

It's a new bike with a 10 speed chain and crankset. After a Google search it seems to be a common problem on this crank. Some claim it's soft FSA rings. So it looks like replacing the rings would be one solution. It spins fine so I may just do that.
RESIDENT GRUMPY OLD MAN.

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Max Gravity
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by Max Gravity

Out of curiosity, can you measure the thickness of the crankarms?
A DA 7800 that I had laying around is 3.47mm (.136)
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the_marsbar
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by the_marsbar

Don't you mean the thickness of the chainrings? Surely the crankarms are wider than 3.47 mm :)

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Max Gravity
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by Max Gravity

Where the rings are mounted on the spider... If the crank are thicker than normal
and that is causing the problem I would change or file down the crank.
Other rings would/should be fine if it is same as Shimano.
Think it would be worth checking before getting new rings, after all new cranks usually comes with rings.
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stefanot
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by stefanot

Been running a Wolfstooth single chainring with no catcher up front with no drop problems. Even in the mud where they mention you SHOULD run a catcher. Not sure if you thought of switching over but a 42T with an 11-28 cassette seems to be the sweet spot around Chicagoland.

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Juanmoretime
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by Juanmoretime

Just switched out to a Rival cross crank and a KMC chain. I think this will fix everything but a ring change probably would have done this too. I like the double crank since I'm mostly doing gravel road riding and racing with my cross bike. I intend to do more cross next season after I have had a chance to sharpen my cross skills.
RESIDENT GRUMPY OLD MAN.

by Weenie


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