The question doesn't make much sense at the current state of engineering.
Decades ago, a nonmetal frame would have been likely to be either excessively clumsy and heavy, or too weak/flexy.
But with the introduction of carbon fiber, and even epoxy bonded wood(particularly bamboo), it's entirely possible to build perfectly functional nonmetal frames.
In fact, nonmetal in the shape of carbon fiber is the prime choice for high performance bicycles.
Most probably the reflective surface will be held in place by a plastic frame.
Yes? It's a size measurement, probably from the center of the cranks to the top(cross)tube. Do a search for bicycle sizingor bicycle fitting and you can read up on whether that bike is likely to fit you or not.
Well, you need a structure to stick the rider on, and the wheels and parts in, and that's what the bicycle frame provides.
You can't adjust a frame
From $100 to $2000, depending on the frame.
Oh, plenty of places. I'd recommend starting by giving the local bicycle club a call, they should be able to recommend a dealer that has a good selection of frame sizes available. The cheaper way would probably be simply to buy a MTB with a small frame, but it would probably need some further adaptation to suit the purpose.
A bicycle. A bicycle with the wheels removed, but everything else it needs attached, is a frame set with gruppo. And just the frame and fork make up a frame set.
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LR Johnson
The frame is the heart of the bicycle, and you only need one frame for one bike. Components can often be moved over to another frame, but unless that frame is exactly the same as the previous one this will make it a new bike.
Yes but it is hard you may want to take it to a welding shop because they might be able to fix it but they may not know how to so it would be easiest to get a new bicycle.
Sure. A steel frame that begins to rust will be undergoing a chemical change.