Can anyone identify the the gray bike for me? It looks like it may have been re-painted at some point in its life. Original color may have been orange. Or red. Wheels appear to have been white originally. Sprocket on the rear axle appears to have a drum brake type system built inside of it. Needs just about everything replaced on it but looks like it'll be really fun when I fix it up. Guy I got both bikes from said its built to run on sandy surfaces with the fat tires.