FRAME SIZE I
Five interchangeable diameters: 3, 4, 5, 6 and 7 inches. Shown top left.

FRAME SIZE II
Six interchangeable diameters: 8, 9, 10, 11, 12, and 13 inches, with 2 feeds/diametral inch and a 1200 speed factor. Shown bottom left.

FRAME SIZE III
Six interchangeable diameters: 14, 15, 16, 17, 18, and 19 inches, with 2 feeds/diametral inch and a 1200 speed factor.

FRAME SIZE IV
Seven interchangeable diameters: diameters 20 through 26 inches.

Special options for the line of Model R machines are also available.
Options include the computerized system, designated TS, which produces contour shaped tubings to match body shapes.