I'm in the same boat. I'm stuck between the STI Roctane or the EFX Motoclaw. I'm leaning towards motoclaw due to being DOT approved. I can tell you that the Roctanes run true to size and you can run a 27 inch tire without mods. And yes you can run the same size all the way around but I'm not certain you can do it with the 12 inch wheel. Maybe someone else with more knowledge will chime in on that. Goodluck