The difference between a 0 degree and a 6 degree stem lies in the angle at which the stem is inclined. A 0 degree stem is a straight stem which means that it sits perpendicular to the steerer tube of the fork, while a 6 degree stem is inclined at an angle of 6 degrees.

The angle of the stem can have a significant impact on the handling and riding position of the bike. A 0 degree stem provides a more aggressive riding position and quicker handling, making it a popular choice for road racing and mountain biking. It also makes the bike look more aggressive. On the other hand, a 6 degree stem provides a more upright riding position and slower handling, making it a popular choice for touring and casual riding. It also makes the bike look more relaxed.

There are several different types of bike stems available, each with its own unique characteristics and properties. Some of the most common types include:

  1. Quill Stem: Quill stems are the traditional type of stem found on most older bikes. They are inserted into the steerer tube of the fork and held in place by a bolt.

  2. Ahead Stem: Ahead stems are a newer type of stem that are becoming more popular. They are similar to quill stems but have a larger clamping area, which allows for more secure attachment of the stem to the fork.

  3. Threadless Stem: Threadless stems are another popular type of stem. They are inserted into the steerer tube of the fork and held in place by a clamp.

  4. Direct Mount Stem: Direct mount stem are designed for specific bike frame and fork. They clamp directly to the fork, eliminating the need for a separate clamp or expander.

  5. Aero Stem: Aero stems are designed for aerodynamics, they are usually found on road bike and triathlon bike where the rider want to minimize the wind drag. They are also often more expensive than other types of stems.

  6. Adjustable Stem: Adjustable stems are a recent development in stem technology. They allow the rider to adjust the angle of the stem, which can be beneficial for finding the perfect riding position.

When choosing a stem, it's important to consider the type of riding you'll be doing, your riding style and body dimensions, and your bike's frame size. It's also important to choose a stem that is the right length, material, and angle for your needs.

When it comes to material, the most common materials for bike stems are aluminum, steel, and carbon fiber. Each material has its own characteristics and properties, which will affect the weight, strength, and durability of the stem. Aluminum stems are the most common and affordable option. They are lightweight and provide a good balance between strength and durability. Steel stems are heavier and stronger than aluminum but are less common. They are mostly used on touring and city bikes. Carbon fiber is the lightest and the most expensive option. Carbon fiber stems are not only lightweight but also offer excellent vibration damping and stiffness.

In conclusion, the difference between a 0 degree and a 6 degree stem is the angle of inclination. A 0 degree stem provides a more aggressive riding position and quicker handling, while a 6 degree stem provides a more upright riding position and slower handling. There are several types of bike stems available, including quill, ahead, threadless, direct mount, aero and adjustable stems. Each type has its own unique characteristics and properties, and it's important to choose a stem that is the right length, material, and angle for your needs. Additionally, you should consider the material of the stem, which will affect the weight, strength, and durability of the stem. With the right stem,you will be able to ride comfortably and safely. It is also important to consult a professional or experienced cyclist to ensure that you are choosing the right stem for your needs, and to have it installed correctly. With the right stem and proper installation, you can improve your bike's handling, performance and overall riding experience.

Bike geometryBike maintenanceBike stemHandlebar positioningHandlebar widthRiding styleStem angleStem lengthStem materialStem types