Parts of A Bike – Bicycle parts list

Parts of a Bike

Getting to Know the Parts of a Bike

It’s important to know the names of the parts of a bike and understand their functions.

This can save you a lot of money and time when you need to fix your bike or want to buy a new part or accessory.

In this article, you’ll get to know the essential components of your bike and how they work.

Bike Part Names

Bike Part Names
Feel free to download this Bike Parts Infographic for your reference.

Here’s a list of bike part names, so you can know what your bike consists of.

I’ll break down all parts of a bike in greater detail later.

Frame parts

  • Top Tube
  • Head Tube
  • Down Tube
  • Seat Tube
  • Seat Stays
  • Chainstays

Seat parts

  • Saddle
  • Seat Post

Wheel parts

  • Hub
  • Rims
  • Tires
  • Spokes

Gear parts

  • Chainset
  • Front Derailleur
  • Rear Derailleur
  • Cassette
  • Jockey Wheel
  • Gear Shifter
  • Chain

Brakes

  • Brake pads
  • Calipers
  • Cables
  • Brake Lever

Handlebar & Fork

Bicycle Frame Parts

Bicycle Frame Parts
Man holding blue bike frame.

Bike Frame

The bike frame is the foundation of the bike, and the parts of bicycle frame listed below give your bike frame its strength.

There are many different parts of a bicycle, and the bike frame holds all the components of the bicycle together.

There are several frame styles.

The diamond frame is the most common frame style and it consists of six tubes.

The Bike frame tubes are:

  • Top Tube
  • Head Tube
  • Down Tube
  • Seat Tube
  • Chain Stays

Bike Frame Parts

Top Tube

The top tube or the crossbar is the horizontal tube of the frame that attaches the head tube with the seat tube.

It’s the tube that you step over when you get on the bike.

Head Tube

The Head tube is the short tube found at the front of the bike. This connects to the handlebars at the top and the fork at the bottom.

Down Tube

This is what gives the bicycle its rigidity. It’s the longest and thickest tube of the frame. It connects the head tube at the front with the pedals at the bottom of the bike.

Seat Tube

It’s the upright tube where you insert the seat post. When you adjust the height of the seat, you adjust how deep the seat post descends into the seat tube.

Seat Stays

These are two thinner tubes that connect the top of the seat tube with the rear wheel hub.

Chain Stays

These are two thinner tubes that run alongside the bike chain parallel to the ground. These tubes connect the rear wheel hub with the crank mechanism.

Bicycle Seat Parts

Bicycle Seat Parts
Saddle

Now that we know what the seat stay and seat tube are, we move on to the seat parts.

Saddle

The bicycle seat is actually what we call the saddle of the bike. The bicycle saddle comes in many shapes & sizes.

The bike saddle has evolved over the years from a simple bike part to one of the main quality factors of a bicycle’s comfort.

Of all the different parts of a bicycle, the saddle (aka the bike seat) is considered by many to be one of the most important parts of any bicycle!

A comfortable bike saddle is essential for any rider, no matter what type of riding you do!

The best saddles will provide good support and cushioning to keep you comfortable on long rides, while also being lightweight and durable.

There are many different types of saddles available, so it’s important to choose one that’s right for you and your riding style.

Here are a few things to keep in mind when choosing a bicycle saddle:

  • Bike Saddle Width: The width of a saddle should be matched to the width of your sit bones (the bones that make contact with the saddle). A saddle that’s too wide or narrow can cause discomfort and pain.
  • Bike Saddle Padding: Too much or too little padding can also cause discomfort. A good rule of thumb is to choose a saddle with enough padding to make contact with your sit bones, but not so much that it causes pressure points or chafing.
  • Saddle Shape: Saddles come in a variety of shapes, from flat and wide to narrow and curved. Again, it’s important to choose a shape that matches your sit bones and riding style. Narrower bike saddles may be more comfortable for road riding, while wider saddles are generally considered better for off-road riding. The width of a bike saddle is mainly a matter of personal preference. Some riders prefer a narrower saddle for road riding, while others find a wider saddle more comfortable for off-road riding. Ultimately, it is best to experiment with different saddle widths to see what works best for you.

Under the saddle, you’ll find the saddle rails which attach the saddle to the seat post via the saddle clamp.

Seatpost

The seat post inserts into the seat tube and adjusts the height of the saddle. The seat post clamp on top of the seat tube tightens to keep the seat post at your desired height

Bike Seatpost Types

The different types of seatposts are:

  • Standard Seatpost: The most common type of seat post, a standard seat post is simply a straight tube that inserts into the frame. Standard seat posts are available in a variety of materials, including aluminum, steel, and carbon fiber.
  • Offset Seatpost: Offset seat posts have an offset design that allows them to be positioned further back on the frame. This can provide more comfort for riders who prefer to sit further back on the bike. Offset seat posts are typically made from aluminum or steel.
  • Adjustable Seatpost: Adjustable seat posts have a lever or knob that can be used to adjust the height of the seat. This is helpful for riders who want to be able to adjust their position on the bike. Adjustable seat posts are typically made from aluminum or steel.
  • Dropper Seatpost; A dropper seat post is a seatpost that has a hydraulic cylinder and can be lowered by a lever located on the handlebar. This type of seat post is very popular with mountain bikers because it allows them to lower their saddle quickly and easily, which can be helpful when descending steep hills. Some dropper seatposts also have the ability to be locked in place so that they function like a regular seatpost, which can be useful for climbing or riding on flat terrain.

Bike Wheel Parts

Bike Wheel Parts
Bike wheels with knobby tires

The bike wheel consists of four parts.

  • Hub
  • Rim
  • Spokes
  • Tires

More details of each part below.

wheel parts names

Hub

The hub is the core of the wheel. It consists of these three components:

  • Shell
  • Bearings
  • Axle

The axel is the part that attaches the hub with the frame, while the hub shell is where the spokes protrude from. The bearing is the part between the axel and the shell.

Rim

The rims are the outer part of the wheels on which the tires are mounted.

Spokes

The spokes are those thin metal tubes that connect the rim to the hub. Their job is to apply even pressure in all directions. This allows the wheel to support your weight and the force you’re applying while you ride.

The spokes connect to the rim through nipples. You tighten or loosen the nipples to adjust the spoke tension.

Tires

The tires are the part that come in contact with the road’s surface. They’re mounted on the wheel rim.

Usually, bicycle tires contain an inner tube that are filled with air through a valve.

Bicycle Gear Parts

Bicycle Gear Parts
Bike Gear Parts

These are the parts that allow you to switch gears. All together these parts make up the bike’s drivetrain.

Parts Of A Bike Crankset

Parts Of A Bike Crankset

The crankset is attached to the bottom bracket. There are two sets of greased ball bearings in the bottom bracket.

The crankset sits into the ball bearings, which allows the crankset to rotate freely.

The bike pedals attach to the bottoms of each crank arm and are what you use to turn the crankset.

A bike crankset is made up of two parts. These parts are:

  • Crank Arms
  • Chainrings

Crank arms: The crank arms are the two long metal rods that hold the chainrings in place and extend from the bottom bracket. The pedals connect to the end of each crank arm.

Chainrings: The front sprockets of the bike are called chainrings.

The chainrings are metal discs with teeth that the chain wraps around. These are attached to the crankarms and are what drive the chain.

If your bike has one gear, then there will be one chainring. If you have a multi-geared bike, you can have up to three chainrings.

Front Derailleur

The front derailleur only available on geared bikes. It moves the chain from one chainring to another when you shift gears.

Bike Cassette

The cassette on your bicycle is the cluster of cogs that are attached to the rear wheel and are part of the bicycle’s drivetrain.

The cassette is attached to the freehub (a type of axle) and contains anywhere from 5 to 11 sprockets.

The largest cog is located on the inside, closest to the bike wheel and the smallest is on the outside, furthest from the bike wheel.

The size of your chainring(s) will determine which size cassette you need for your bike.

There are 2 standards for cassettes, Shimano/Sram and Campagnolo but they are not compatible with each other.

The main purpose of the cassette is to provide a range of gears for the rider so that they can pedal efficiently whether they are going up a hill or cruising on flat ground.

Rear Derailleur

The rear derailleur does the same job as the front derailleur. But it moves the chain from one cassette cog to another when you shift gears.

Jockey Wheel

The jockey wheel applies tension to the chain to keep it moving smoothly as you switch gears. It may also be available in single-geared bikes.

Gear Shifter

The gear shifter is a hand lever attached to the handlebar. This allows you to shift gears via a cable that moves the derailleurs.

Bicycle Pedals

The pedals attach to the crankset at the ends of the crank arms.

There are three primary types of bike pedals:

Flat Pedals, Mountain Bike Clipless, and Road Clipless.

There is much debate as to which is superior. However, it ultimately comes down to your riding style and the bike you are using.

Flat Pedals

Flat pedals are the simplest type of pedal and are often used on mountain bikes.

They consist of a flat surface for your foot to rest on, and usually have some sort of tread or grip to keep your foot from slipping off.

Mountain Bike Clipless Pedals

Mountain bike clipless pedals are similar to road clipless pedals but are designed for use with mountain bike shoes.

They have a small cleat that attaches to the bottom of your shoe and clip into the pedal itself.

This provides a more secure connection between you and the bike and helps to increase pedaling efficiency.

Road Clipless Pedals

Road clipless pedals are the most popular type of pedal for road cycling.

They consist of a large platform for your foot to rest on, and a small cleat that attaches to the bottom of your shoe.

The cleat clips into the pedal, providing a very secure connection between you and the bike.

Road clipless pedals help to increase pedaling efficiency and are often used in racing or other high-intensity riding.

There are many arguments as to which is better.

But ultimately, it depends on your riding and the type of bike you’re using!

Bicycle Brakes

Bicycle Brakes
Bicycle Disc Brake

The traditional bike brake system consists of the following:

  • Brake pads
  • Calipers
  • Cables
  • Brake lever

How the Brakes Work

  1. You pull on the brake lever
  2. The brake lever pulls on the brake cable
  3. The brake cable pulls on the brake calipers, causing the brake pads to squeeze the disc or rims, which stops the bike.

Bicycle Handlebar

Bicycle handlebar
Bike Handlebar

The handlebar is what you hold onto and use to steer the bike. They come in different styles.

The handlebar runs through the end of the stem, which is what connects them to the frame. The handlebar is one of the components of the headset.

The headset sits inside the head tube and it allows the bike to rotate when you rotate the handlebars.

The handlebar and it’s various controls are also commonly referred to as the bike’s cockpit.

Bicycle Fork

Bicycle Fork

The fork of the bike is the tube that connects the front wheel to the frame.
The fork consists of two parts:

  1. Fork blades
  2. Steerer tube

At the bottom of the fork, you’ll find the fork blades. They connect the front wheel with the head tube.
The steerer tube rests inside the head tube connecting the headset.

Bicycle Chain

Bicycle Chain

Most of us know the bike chain, but do you know what it does?

The chain is in charge of moving the rear wheel. It loops around the chainrings of the chainset and the cogs of the cassette.

What Are Bike Parts Made Of?

Various parts of a bike can be made of different materials.

The frame is usually made of steel, aluminum alloy.

More expensive bike frames are made of carbon fiber or titanium.

  • Steel is the cheapest and also the heaviest, so professional cyclists try to stay away from it.
  • Aluminum is light and inexpensive, but it doesn’t provide the best ride experience.
  • Carbon fiber and titanium are the best bicycle parts materials. They’re light and durable but are also pretty expensive. High-end bikes are usually made of titanium or carbon fiber.

Other components can also be made of aluminum alloy, carbon fiber, steel, plastic, or nylon.

How Are bike Parts Connected to the Rest of the Bicycle?

How Are bike Parts Connected to the Rest of the Bicycle

The various parts of a bike are connected to the bike frame using fitted threaded fasteners.

These fasteners are usually made of steel or other hard metals. Some need to be tightened hand tight only.

Others must be snugged down more firmly.

When these metal fasteners become worn, they must be replaced.

The rider’s safety depends on all parts of the bike being in good working order.

The frame is the core that connects all the above-listed bike parts. Without it, there wouldn’t be a bike.

Wrap Up!

Now you know all the essential parts of your bike, their names, and their functions.


The frame is the core that connects all the above-listed bike parts. Without it, there wouldn’t be a bike.

We hope you learned a lot!

What’s Next?

If you enjoyed this article go check out my Guide To Winter Cycling Gear!

Happy Cycling!

About Informed Cyclist
Michael Rogers
I’m Michael, a cycling fanatic and the founder of Informed Cyclist. I started this site to give back to the sport I love! My mission is to bring the very best cycling advice & know-how to my readers. I hope you enjoy this site as much as I love working on it. I put a lot of heart & effort into it!