Free Flow Chains have dimensional restraints and so require special sprockets.
Tsubaki offers sprockets for Dual In addition Chains, sprockets for Double In addition Chains with best 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/Middle Roller Chain. Can be 
used with Double Plus Chain with snap covers.
Details
Sprockets for Double Plus Chain with Outboard Rollers
Make use of Sprockets for Double Plus Chain.
Details
Sprockets for RS Chain with Outboard Rollers
Outboard rollers on RS Chain with outboard rollers might interfere with sprocket hubs based on the amount of sprocket teeth. Utilize this special sprocket rather.
Details
Sprockets for Double Plus Chain with Best Rollers
R Rollers on Dual In addition Chain with Top Rollers could cause interference with regular sprocket teeth. Utilize this special sprocket instead.
Details
Sprockets for RS Chain with Best Rollers
Make use of Drive Sprockets.
Details