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Bicycle stems are essential components that connect the handlebars to the bicycle's head tube. They play a crucial role in the positioning of the handlebars and the comfort of the cyclist. Here is a description of their function, their characteristics, the standards and the different types of stems for track bikes:

Function :

1. Handlebar attachment:

Stems secure the handlebars to the bike's head tube, providing a solid point of contact between the rider and the bike.

2. Height and length adjustment:

They allow the height and length of the handlebars to be adjusted, which influences the cyclist's position on the bike and their riding comfort.

3. Stability and precision:

Stems contribute to stability and steering precision by effectively transferring movements from the rider to the bike.

Features :

1. Length:

Stems come in various lengths, usually measured from the center of the stem pivot to the center of the handlebars. A longer stem can provide a more stretched and aerodynamic position, while a shorter stem promotes a more upright and comfortable position.

2. Angle:

Some stems have a tilted angle up or down relative to the direction of the head tube. This can affect the height and reach of the handlebars, allowing the rider to adjust their riding position.

3. Material:

Stems are typically made from aluminum, steel, carbon, or titanium alloy. Each material has its own advantages in terms of weight, stiffness and durability.

Standards:

1. Tube diameter:

The diameter of the stem's gooseneck must match the diameter of the bike's head tube for proper fitment. Common standards are 1 inch (25.4 mm) and 1 1/8 inch (28.6 mm) for track bikes.

2. Handlebar clamp diameter:

The diameter of the stem clamp must match the diameter of the handlebars. Common diameters are 25.4mm and 31.8mm for track bikes.

Different types of stems for track bikes:

1. Straight stem:

A straight stem with a 0 degree angle, providing a neutral and stable riding position.

2. Inclined stem:

A stem with a positive angle, tilting the handlebars slightly upwards for a more upright and comfortable riding position.

3. Negative rise stem:

A stem with a negative angle, tilting the handlebars slightly downward for a more aerodynamic and aggressive riding position.

4. Adjustable stem:

A stem with an adjustable mechanism to adjust the angle and height of the handlebars, providing greater flexibility in rider positioning.

In summary, trail bike stems come in a variety of lengths, angles, and materials to meet the rider's specific needs for positioning and riding comfort. With specific features such as length, angle and material, as well as manufacturing standards, they contribute significantly to the rider's performance and comfort on the track.

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