- I am not certain that is universal. It’s part of what I have been searching for and have some incomplete info that sheds at least some light.
Looking at chain specs for outside width:
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I am not sure if this is purely plate thickness or if the inner gap and roller are a tighter space too.
If we look at Sprocket (Cog) Thickness changes in this chart:
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I suspect that since the Cog thickness gets thinner, actual gap between the chain also gets thinner in likely an equal measure (or something close).
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I say that because it’s hard to imagine them making cogs thinner and leaving the inner chain width wider. It would allow the chain more “wiggle room” on the cog which seems the opposite of what leads to snappy and accurate shifting.
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But this is speculation based upon incomplete info, missing 12s info specifically while 10s-11s is 1.6mm. I thought I had found a different site with actual inner chain width specs, but am failing to find it right now.
ETA: Found the other resource I had in mind. It has some outer and inner chain width info, but MTB only from what I see now:
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This indicates the chain inner width matches for MTB from 9-12s. It may hold for road too, but I am still working to find that info.
Their Road Cassette info seems to mostly parallel the MTB chain info:
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But sadly missing the Shimano 12s Road.
