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.
The recommended bicycle frame size according to the bicycle frame size chart in centimeters is based on the rider's height. It is important to choose a frame size that allows for a comfortable and efficient riding position.
The specific bike frame model used in this bicycle is the "Aluminum Alloy Frame."
The bottom bracket dimensions for this bicycle frame are the measurements of the part that connects the crankset to the frame.
The XL frame size for this bicycle model is 58cm.
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.
To determine the correct bicycle frame size using a bicycle frame size chart in inches, measure your inseam length and compare it to the recommended frame size range on the chart. Choose a frame size that falls within that range for the most accurate fit.
The XL frame size for this bicycle model is currently available.
The minimum seatpost insertion requirement for this bicycle frame is 4 inches.
The frame of a standard bicycle is typically around 18 to 22 inches in size.
The recommended frame size for a medium frame size bicycle is typically around 54-56 centimeters for adults.
Well, you need a structure to stick the rider on, and the wheels and parts in, and that's what the bicycle frame provides.