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What are Bike Frames?

By Ken Black
Updated May 23, 2024
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Bike frames are the portion of bikes that are not the wheels, pedals, handlebars, or seat. In short, a bike frame is the main support structure of the bike, located primarily between the two wheels and the pedals and the seat. Bike frames can be purchased separately or, more commonly, come included as an entire package.

There are a number of components to bike frames. The first is the top tube, which is the horizontal bar that runs up toward the top of the bike frame. The head tube holds the handlebars and goes down to the fork at the front of the bike. The fork is attached to the wheel. The down tube is a diagonal bar that usually goes diagonally down to the chain wheel from just below where the top tube connects to the head tube. The seat tube runs from the saddle link down to near the chain wheel.

In addition to these main tubes, there are other components to bike frames called seat stays and chain stays. The seat stay goes from the top of the seat tube down to the rear portion of the bike, near where the rear wheel connects to the frame. The chain stay also connects to that portion of the frame, but instead of running to the seat, runs to the chain wheel.

It is important to note that while the above components describe the vast majority of bikes, some bike frames may not have all of these components. The components are often based on the latest available technology, or at least the price one may be willing to pay for that technology. Overall, despite advances in technology, bike frames have changed very little since the "high wheeler" bicycles of the 19th Century.

Bike frames are also made out of a number of different materials. These materials have changed substantially over time to make bike frames lighter, more durable, and provide an addition level of comfort, in some situations. Common materials for bicycle frames include: aluminum, steel, carbon fiber and titanium.

Each of these materials used in bicycle frames may have their own advantages, but for the recreational user it may not matter much. Those who need a performance bike frame will spend a considerable amount studying different materials. Titanium is becoming increasingly popular for performance racing bikes. However, those looking for just a serviceable bike to get around on will likely choose steel, which is one of the cheaper material options.

Sports n' Hobbies is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
By summing — On Mar 13, 2012

What is a good price to spend on a middle of the road bike frame? I do not need some super fancy frame, just something that I can pedal around the city. Maybe a Schwinn bike frame or something.

I never know if I can trust the guys in the bike store. Sure they know what they are talking about, but they are also salesman and it is their natural instinct to try to sell you more bike than you need. It would be a big help to get an unbiased opinion in this area.

By chivebasil — On Mar 13, 2012
How do I know if a bike frame is good or bad? I have seen a lot of mountain bike frames and road bike frames for sale, but I never know if I am getting a deal or getting cheated. I know that not all bikes are created equal and I would hate to spend the time and money on a frame that is only going to let me down.
By truman12 — On Mar 12, 2012

Sometimes the best way to get a deal on a bike is to find a used bike that has a good frame but bad tires and breaks or whatever and to then salvage the frame and build a new bike up around it. The frame is the most sturdy and most important part of the bicycle. It is pretty easy to find good frames that have bad parts connected to them.

I have made four or five bikes by finding good deals on frames and then attaching used wheels, gears and brakes to them. Bikes are incredibly simple and easy to maintain machines. You can find parts that might not be in perfect condition and then restore them to perfect working order. That is the beauty of bicycles. They are truly the most economical and universal kind of transportation.

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