Free Flow Chains possess dimensional restraints and so require particular sprockets.
Tsubaki provides sprockets for Dual In addition Chains, sprockets for Dual In addition Chains with top rollers, and sprockets for RS Chain with outboard rollers.
Product Lineup
Product Types / Features
Sprockets for Dual Plus Chain/Middle Roller Chain
Sprockets for Dual Plus Chain/Middle Roller Chain. Can be used with Double Plus Chain with snap covers.
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Sprockets for Dual In addition Chain 
with Outboard Rollers
Make use of Sprockets for Dual Plus Chain.
Details
Sprockets for RS Chain with Outboard Rollers
Outboard rollers on RS Chain with outboard rollers may hinder sprocket hubs based on the number of sprocket teeth. Utilize this special sprocket instead.
Details
Sprockets for Dual Plus Chain with Top Rollers
R Rollers on Dual In addition Chain with Top Rollers may cause interference with regular sprocket teeth. Use this special sprocket rather.
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Sprockets for RS Chain with Top Rollers
Make use of Drive Sprockets.
Details