I came across an old mountain bike in a barn and have no clue what brand it is, but it was brush painted black. From the scratches it looks as if it was green at one time. Anywho I had the idea of putting a 24 inch on the back and leaving a 26 on the front to give it a little different look to it. It has a rear a disk break so I will still be able to stop. Has anyone else done this?