Selecting the right frame for your needs makes all the difference in the world if you enjoy bicycling. Frames come in many materials: Aluminum and carbon are just two possibilities. The material used to make the frame adds a distinctive element to the bike, and knowing the features of each can help you make the appropriate selection.
Material
Technically, frames made of aluminum are known as alloy, or aluminum alloy. This means the designer combines other materials with the metal to create the frame. The lightweight material makes an aluminum bike a reasonable choice for just about any rider. Carbon frames are constructed using a fiber base that includes an epoxy. In other words, carbon fibers bind together with strong glue to make the structure of the bike. Carbon eliminates the use of metal for the foundation by adding graphite bound together to create a shape.
Tube Size
The stiffness of a bike frame is part of what makes it workable, but not something most novice riders would notice. An experienced cycler will consider it a key feature. Both aluminum and carbon frames are stiff, but the tube construction differs. There is no set rule for the tubes on a carbon frame, and the nature of the material allows for varying designs. A carbon structure can have either thick or thin tubes, so it will be less stiff than the standard aluminum alloy. The molding process for carbon is flexible, which makes it the material of choice for unusual shapes. Aluminum can be made in different aerodynamic shapes, but thick tubes are necessary to make the frame sturdy.
Cost
The most relevant factor in determining if a carbon or aluminum frame is right for you is cost. Aluminum is an economical material and therefore makes a less expensive bike. Carbon is expensive, so the bike will be as well.
Frame Strength
Website Bike 101 explains that even though carbon costs more, it might not be any more stable. If made incorrectly, the frame can crack. A metal like aluminum will be strong and less prone to breakage. A carbon frame also might not hold as much weight as the aluminum, which means if you are a large rider you might be better off with aluminum.
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