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Bugger, now I'm just confused.
"16t: blue locking ring, accommodates 3/32 chain only, Bearing size 6708
17t- 23t: red locking ring, accommodates 3/32 and 1/8 chain, bearing size 6808
18t,20t, 22t trials: green locking ring, accommodates 3/32 and 1/8 chain, bearing size 6808
16/18t DOS: blue locking ring, accommodates 3/32 chain only, bearing size 6708
17/19t, 20/22t DOS: red locking ring, accommodates 3/32 chain only, bearing size 6808"
BareNecessities
I believe the cog 16t is different than the 17t-22t. It's got different bearings and a blue lock ring rather than red.