You should know one thing before you buy this bike – it is indestructible. You will get bored of this bike before you see the effects of time on it. The Unknow SC-1 is a shockproof bike. With a 4130 chromoly steel frame this is a bike that will stand up to the rattling of the worst paved streets in your city and all the tricks you want to do with it.You\'d think that all this strength would result in a hefty weight, but it doesn\'t – it\'s a very modest 9.4kg in size M. The components of the Unknown SC-1, except for the chain, are all manufactured by Unknown itself, a genuine sign of quality and strength.