I don't think that non-motor bikes really need to be added to the gear section any more than deodorant needs to be.
It serves a basic function: gets you from a point A to point B. Unlike a car or motorcycle, the amount of customization you can do with it is extremely limited. It provides no protection from...well, anything, and can't be used for much else than it's intended purpose: transportation. So, a GM can rule that a bike costs anywhere from 50-200 nuyen, and depending on how good the bike is, it can get you to any given place X% faster. It doesn't need a statline, street cost, or anything else that appears with a typical gear entry. It can be a useful tool, but so can a hammer. Doesn't mean it needs it's own entry in the book.
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Therefore, the windows by RAW are in fact, armored.
RAW rarely captures the spirit of the rules, and even more rarely the fun of them. If you shoot a window, and it's not plated glass, it's not going to have armor.
Like Larme says, it really depends on the kind of vehicle in question. Simply saying "Oh, it has the same armor as the rest of the car due to a glitch in the rules!" kind if takes the fun out of things.
Besides, remember that one bug in the rules with the cybersmelling? It was a simple augmentation, 1000 nuyen a level, that added +1 perception dice for each level. It was meant to have three levels, like most augmentations of that type. But a glict in the wording left this out, meaning that by RAW, you could buy out as many levels of this at you wanted. I recall someone on these very forums talking about how THAT could be abused...
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I shell out 500k, and suddenly I have 500 perception dice for scent based tests. Suddenly, EVERYTHING is a scent-based perception test. I can smell what people wrote on a datapad. I can smell someone smile from three rooms away. I can smell the FUTURE.
Don't always rely on RAW for your fun.