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The early versions of David Bradley tractors were equipped with a one piece frame. The handlebars consisted of two tubes which were bent in such a way as to clamp to the side of the gear case and continue forward to provide a mounting point for the engine mount. The handlebars were suported at the top by a welded cross tube, which also served to mount the clutch levers. A flat spreader bar was welded just behind the gearcase location, not only for support, but also to provide a mounting point for the saddle bar. There were two round rod braces welded diagonally at the lower bend behind the gearcase to stiffen that area. All other support came with the assembly to the transmission and engine mount, which added to the stability of the frame.
The one piece frame was used on the following tractors:
5751, 5752, 5756, 57560, 57561, 57562, 57571, 57598, and the 575102
In the mid 50's David Bradley introduced the two piece frame, which was stronger in some respects, and also added the ability to adjust the height of the handlebars in one of three positions. When it was first introduced, there were more parts to assemble in the initial setup, but later tractors with two piece frames were shipped mostly assembled. Since many tractors were shipped to the customer in crates, the customer was responsible for initial setup of the tractor in these cases. The two piece frame allowed the engine, transmission, and other major assemblies to be pre-assembled in one unit, with all controls adjusted at the factory. The customer would then need only to add the handlebars and levers, and mount the wheels to have a fully functional tractor.
The two piece frame was used on the following tractors:
57583, 57584, 57597, 57599, 575100, 575104, 575105, 575111, 575112, 575119, 575120, 575121,
575131, 575134, 575135, 575138, 575139, 575142, 575143, and the 575144