Free Flow Chains have dimensional restraints and so require unique sprockets.
Tsubaki provides sprockets for Double 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 Double Plus Chain/Middle Roller Chain
Sprockets for Double Plus Chain/chain sprocket Center Roller Chain. Can be used with Dual 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 upon RS Chain with outboard rollers might interfere with sprocket hubs depending on the number of sprocket teeth. Utilize this special sprocket rather.
Details
Sprockets for Double In addition Chain with Top Rollers
R Rollers on Dual Plus Chain with Best Rollers could cause interference with standard sprocket teeth. Use this special sprocket instead.
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Sprockets for RS Chain with Best Rollers
Make use of Drive 
Sprockets.
Details