Maybe this will be useful to others, maybe it will wither, but...here goes.
There are many aluminum bicycle frames that have a steel fork (usually the desirable CrMo/Chromo/Chromium-Molybdenum), which are steels in the 41XX designation range. When a builder is contemplating doing custom work to an existing frame...torch-brazing or TIG-welding aluminum is an option, but due to "strength of the material" concerns, one must be aware of issues that may arise from "heat treating" and "annealing" aluminum, so...some homework should be done ahead of time to avoid unexpected (and expensive) changes in plan...
Some builders have found that the small extra weight that results from using a steel frame is negligible when the total weight of an electric bike system is taken into consideration. Using a steel frame can make certain aspects of a custom design much easier and faster to achieve. Even if a particular builder did not have access to steel-welding equipment...a local muffler shop (or any other industrial fabrication shop) can be used to affordably weld parts that you have cut to shape (or have had water-jetted/laser-cut).
I would not object to a posting of an older frame, but my main goal is to make information available to allow potential builders to select a readily available frame that can be used as the basis of a custom project.
There are many aluminum bicycle frames that have a steel fork (usually the desirable CrMo/Chromo/Chromium-Molybdenum), which are steels in the 41XX designation range. When a builder is contemplating doing custom work to an existing frame...torch-brazing or TIG-welding aluminum is an option, but due to "strength of the material" concerns, one must be aware of issues that may arise from "heat treating" and "annealing" aluminum, so...some homework should be done ahead of time to avoid unexpected (and expensive) changes in plan...
Some builders have found that the small extra weight that results from using a steel frame is negligible when the total weight of an electric bike system is taken into consideration. Using a steel frame can make certain aspects of a custom design much easier and faster to achieve. Even if a particular builder did not have access to steel-welding equipment...a local muffler shop (or any other industrial fabrication shop) can be used to affordably weld parts that you have cut to shape (or have had water-jetted/laser-cut).
I would not object to a posting of an older frame, but my main goal is to make information available to allow potential builders to select a readily available frame that can be used as the basis of a custom project.