GT Team Brian Kachinsky BMX Bike 2019Brian Kachinsky has an all out, high speed technical approach to his riding. Kachinskyhas become a descriptor for some of the craziest city features in the world. And his line of bikes is designed to give you the confidence you need to learn the foundations to one day conquer a Kachinsky and make sure you look good while doing it. ###section### Product Specs FRAME MATERIAL: Chromoly Front End, Hi Ten Steel rear end WHEEL SIZE: 20" TOP TUBE LENGTH: 20.