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Is My Chain too long?

Old 03-25-22, 05:38 PM
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BikingViking793 
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Is My Chain too long?

I'm working on a new build, and it seems like maybe my chain is too long? I used the largest cog/largest chainring method to get the length. The guide pulley is really not close to the largest cog at all when on the largest cog and chainring. The angles of the chain going through the pulleys seem a bit more than slight also. It also stalls sometimes moving to the smaller cogs when shifting. Let me know what you think. I'd hate to remove too much.


Largest cog and largest chainring

smallest cog and chainring
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Old 03-25-22, 05:42 PM
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Any noise on small/small?

Is your range within the capability of your RD?
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Old 03-25-22, 05:51 PM
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Originally Posted by downtube42 View Post
Any noise on small/small?

Is your range within the capability of your RD?
Small/small the chain will rub the large chainring. I guess that's just something that happens sometimes with a compact crankset? Other than that no odd noise.

Yes the cassette is a 11-28. Which is in the range of the derailleur.
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Old 03-25-22, 06:21 PM
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Looks fine to me. How's the adjustment on the B screw?
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Old 03-25-22, 09:43 PM
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You don't check/adjust for B gap in the large chainring, you do it in the small ring. Length looks fine to me.
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Old 03-26-22, 12:46 AM
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Originally Posted by BikingViking793 View Post
Small/small the chain will rub the large chainring. I guess that's just something that happens sometimes with a compact crankset? Other than that no odd noise.

Yes the cassette is a 11-28. Which is in the range of the derailleur.
Chain rub is a different matter, which you're right you may or may not be able to trim out. Just avoid cross chaining if you can't.

Your probably fine, but RD range has to cover cassette range plus chainring range.
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Old 03-26-22, 03:11 AM
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I've always used the advice from the Park Tool video - essentially big ring and biggest sprocket (bypassing the RD) and add two rivets.
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Old 03-26-22, 09:54 AM
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Originally Posted by Welshboy View Post
I've always used the advice from the Park Tool video - essentially big ring and biggest sprocket (bypassing the RD) and add two rivets.
That what I did for this one. I must have did it right based on the feedback. Thanks
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Old 03-26-22, 10:12 AM
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Are you having an issue shifting to the 12 or 11 cog on the rear? Does your chain fall off the front when you are in the small/smalls and trying to shift?

If not you are probably good. But check your b-screw adjustment in the small cog first. I usually run though all the gear combos just to see how the jockey wheel clearance is, but maybe that's overkill.
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