Free Flow Chains possess dimensional restraints and so require special sprockets.
Tsubaki sprockets offers sprockets for Double In addition Chains, sprockets for Double In addition Chains with top rollers, and sprockets for RS Chain with outboard rollers.
Product Lineup
Product Types / Features
Sprockets for Double Plus Chain/Center Roller Chain
Sprockets for Double Plus Chain/Center Roller Chain. Can be used with Double Plus Chain with snap covers.
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Sprockets for 
Dual Plus Chain with Outboard Rollers
Use Sprockets for Dual Plus Chain.
Details
Sprockets for RS Chain with Outboard Rollers
Outboard rollers upon 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 In addition Chain with Top Rollers
R Rollers on Double Plus Chain with Top Rollers may cause interference with standard sprocket teeth. Utilize this special sprocket instead.
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Sprockets for RS Chain with Best Rollers
Make use of Drive Sprockets.
Details