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This Seat Knob Kit, Fore-Aft Adjust, Star Trac is designed for the fore-aft adjustment on some indoor cycle models by StarTrac.
The fore-aft adjustment is the slider position forward and backward in the seat post, helping maintain the correct seat position on compatible bikes.
Browse more parts in Cycling > Parts & Components > Drivetrain, or view a related item like Crank Arm With Collar Kit.