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First Position Cassette Cog Question

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First Position Cassette Cog Question

Old 04-20-17, 11:36 PM
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First Position Cassette Cog Question

Making a 11 speed Cassette into a 10 speed to fit a 8,9,10 wheel. I want to drop the 11t cog as I have no use for it. Can I use the 12t cog with the appropriate 12t lock ring even if the cog doesn't have the little groves in it. This is a Sram 11-28 cassette with the 11, 12 & 13t's being separate. The 12t & 13t have built in spacers and the 12t has an indent for the lock ring to set down in it. It does not have the matching grooves like the lockring or a proper first position cog would have. I guess the question is would the lock ring work itself loose with the cog not having the grooves.
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Old 04-21-17, 01:40 AM
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do you have 11speed shifters and are going to make 1 click redundant ? if so then dropping the 11t is an option but you will probably need to add a spacer behind the cassette to get the 12T cog proud of the freehub. In regards to the 12T not having the little grooves that the lockring bites into, I have locked up the odd cassette with a non grooved small cog and never had it loosen off (having no ratcheting noise while locking it up is a little off putting though)
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Old 04-21-17, 02:56 AM
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I believe Shimano 11T cassettes typically have both first position 11T and first position 12T sprockets. But that would only help with your next cassette. I'd go ahead and try what you have.
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Old 04-21-17, 06:45 AM
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Just buy the appropriate 10 speed cassette.
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Old 04-21-17, 07:01 AM
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Originally Posted by trailangel
Just buy the appropriate 10 speed cassette.
This cassette is for a 11 speed drive train to be used with an older 8,9,10 speed free hub that cannot be converted.
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Old 04-21-17, 07:53 AM
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I know a 12t lockring will work on a non-serrated 2nd position cog as I've been using just that on a bike for over 12k miles with a 13t cog. I would think the 11t lockring would also work but possibly the smaller diameter may be an issue but I doubt it. Just make sure you tighten the lockring properly and then check it after the first couple of rides to make sure it stays tight and if no problems you should be good to go.
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Old 04-21-17, 10:42 PM
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I've use bigger cogs with out serrations as my high gera cog without problems. If you're really concerned about the lock ring backing off you could always use a non-permanent thread locker.

Cheers
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