No idea. But Transition DONT have: That gusset by the headtube. Brake mounts like those. Cable mounts on the top tube like that. That frame is far to big to be one. The 26 inch ones were almost inverted at the seat tube junction. A reinforcing tube on the chainstays. They are also have far thicker stays and the stays are straight. Transitions DO have: Horrizontal Dropouts Intergrated Headset. Hose guides under the toptube. And most importantly. DMR stamped into the dropouts.