Patent 5619007 describes a “bicycle mounted bulletproof armor shield system.”
Armor plating is installed inside the main triangle and rear triangle. According to the patent:
Peace officers are using a new form of transportation, the bicycle, which has greatly enhanced their ability to perform their duties.
Unfortunately, peace officers on bicycles are extremely vulnerable to gunfire. There is simply no room on the bicycle for an enveloping armor protection system; a est of the “flak jacket” type is out of the question, and a clipboard or portable shield is too bulky and cumbersome.
Accordingly, one object and advantage of this invention is to provide a bulletproof armor shield system which is incorporated within the framework of the bicycle itself.
The idea is that the bike patrol officer who comes under fire crouches behind the protection of his armored bicycle. There’s no discussion on how this bike might handle in a crosswind or even when passed by large trucks in traffic.
I think somebody has been watching too many action films.