This is an upgrade set of BMX-class precision freewheels (like what's included in the Forward). If you add this to your cart at the same time as a GRIT Freedom Chair 2.0, we will upgrade your chair with these during assembly. If you already own a GRIT Freedom Chair, you will need a bicycle shop to help with the installation. This includes two freewheel drivetrain and coupling assemblies, one for each side of the chair.