PROTO was the first company to release a threadless fork, use a threadless headset and develop "Y" shaped handle bars (among other world's firsts) so it is only natural that we would be the first to invent an entirely new component to hold it all together. The PROTO Full Knuckle SCS™ is the original and first Standard Compression System and fundamentally changed the way a freestyle scooter was built and effectively revolutionized the freestyle scooter after market parts industry. The Full Knuckle SCS™ is still the strongest and most universally compatible SCS™ ever created.
The PROTO Baby SCS™ is a more refined SCS™ than it's big brother, the Full Knuckle. It caters to riders who prefer standard 1¼" handlebars. It is less compatible than the Full Knuckle but the weight advantages of having a smaller, lighter SCS™, easily make up for its compatibility shortcomings.
The Half Knuckle Double Clamp is here for riders who have not yet made the switch to the Standard Compression System. It is only half the size of the Full Knuckle but maintains a tighter grip on your bars than any other standard double clamp on the market.