Profile Design J4 Bracket Kit Bike Accessories_Bike Trailers There are two bearing options

There are two bearing options

and adding a proprietary mix of 4 different Graphene compounds

Built to handle just about anything

Charge your devices with the battery of the PWR Commuter

and jacking for a fantastic ride

Profile Design J4 Bracket Kit Bike Accessories_Bike Trailers There are two bearing optionsProfile Design's J4 Bracket Kit lets you fine tune your aero position down to the millimeter. For lightness, strength and aerodynamics, the brackets are made of forged and CNC machined 6061 aluminum and have Marine quality 12. 9 grade bolts that are corrosion resistant and hidden. For easy and fast adjustability, by simply loosening the fixing bolt on each side you can slide your extensions in and out. Meanwhile, the brackets hold the armrests set