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Model : 18
This 18t cog smooths out the cog to cog transition when using the 46t or 48t or 49t cog and 11/40 or 11/42 11s cassette.Compatible only with 11s 11/40 or 11/42 cassette
Remove the 17t and 19t stock cogs, and mount the 18t cog (+ 46t or 48 or 49t outer cog)