These frames were specially designed to work with the legendary "Magnum Motors" first built in the late 60's These motors feature a 45" lower end with a 900cc Sportster top end, and they not only looked cool, but they ran as good as they looked These Magnum Motor frames feature single front downtube styling, and the ability to use a 4-speed Big Twin transmission 2" out, 4" up, 30° rake Does not have gas tank mounts Set up for rear disc brakes