According to the design evolution observed after 1885, what material replaced the wooden frame of the Reitwagen in subsequent developments?

Answer

Steel tubing

The wooden frame of the Reitwagen, while adequate for initial testing of the engine, highlighted inherent structural weaknesses, being both fragile and susceptible to vibration and wear over time. The immediate progression seen in vehicles developed shortly after 1885 involved replacing this wood with steel tubing. This substitution was necessary to create the rigid frames required to handle the increased power outputs and higher speeds that inventors were striving for in the next generation of motorized two-wheelers.

According to the design evolution observed after 1885, what material replaced the wooden frame of the Reitwagen in subsequent developments?
inventionVehiclefirstYearmotorcycle