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