Sure, back in prewar times you could buy a 26" Schwinn ballooner with one of three frame sizes. 16", 18" which was the standard size, and 20". The 20" frame took a different fork so it would be good to find a complete bike or at least a frame and fork. Hooch had one for sale a couple of years ago and I should have jumped on it. Here's a pic of my DX with a 16" frame. Notice how the rack is at a wrong angle. Wrong rack. The 16" and 20" frames took special racks. Also a pic of two 20" frame bikes owned by a member from Alabama. All postwar Schwinn ballooners had the standard 18" frame and they did away with the others. Gary