Letting the 125 supermini sing around the_trailer_park_mx. If a brand produced a supermini sized 125 2-stroke, would you get one? We get a ton of questions about this full custom bbrmotorsports Supermini 125 build, so here is a rundown. This is a complete one off Supermini sized bike that we put a YZ125 engine into. I have tons of fun ripping Supermini sized bikes but struggle to keep them alive as an adult. We talked about just building a aluminum framed Supermini to keep the frame from bending and breaking everything around it. But had also talked about putting a 125 into a Supermini so that it has tons of fast, fun, and reliable power. My dad duanebrown_bbr got to work on this dream project putting in over 300 man hours of milling, welding, machining, and grinding to make this thing a reality. This is NOT a cut down 125 frame, he made the frame from scratch. Nothing off of a YZ125 frame was used. By the end of it he made a full one off aluminum Supermini frame, linkage and swingar...