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Detailed Description:

Quill Diameter: The quill diameter of 21.1 mm ensures compatibility with standard quill stems, commonly found on many older or vintage bicycles. This diameter is slightly smaller than the more common 22.2 mm, so it's important to check compatibility with your specific bike.
Bar Clamp Diameter: The bar clamp diameter of 22.2 mm fits standard handlebars, making it versatile for various handlebar types used in BMX and other bikes.
Stem Length: With a stem length of 55 mm, this stem offers a balance between responsiveness and control, suitable for BMX riding where quick handling is essential.
Quill Length: The quill length of 4-1/4 inches (approximately 108 mm) allows for a secure fit within the steering tube of the fork, providing stability and strength.
Fork Compatibility: Designed to be compatible with 1-inch forks, making it suitable for a wide range of BMX bikes and other bicycles that use this standard size.
Angle: The 0-degree angle provides a direct and flat extension from the steerer tube, which is ideal for maintaining a consistent and aggressive riding posture, common in BMX riding.
Material: Made from high-quality alloy, this stem offers a combination of strength and lightweight performance. Alloy is known for its durability and resistance to corrosion, ensuring long-lasting use.
Style: Specifically designed for BMX bikes, this stem supports the rigorous demands of BMX riding, including jumps, tricks, and high-impact maneuvers.
Ease of Installation: The quill stem is straightforward to install. Insert the quill into the steerer tube and tighten the bolt to expand the wedge inside, securing the stem in place. Ensure the handlebar is centered and the stem is aligned with the front wheel before fully tightening.
Ideal for BMX bikes, this stem is perfect for riders looking for a reliable, strong, and lightweight option that can handle the demands of BMX riding.
Suitable for vintage or older bikes with a 1-inch fork and 22.2 mm handlebar clamp size.

Benefits:

Strength and Durability: The alloy construction provides robust performance, capable of withstanding the stresses of BMX riding.
Lightweight: The use of alloy material keeps the stem lightweight, contributing to overall bike performance without adding unnecessary weight.
Compatibility: Fits standard BMX handlebars and forks, making it an easy upgrade or replacement part.
Stability: The quill design ensures a secure fit in the steering tube, maintaining stability and control during rides.

This 450 Alloy Stem is designed to provide BMX riders with the performance and reliability needed for both casual riding and competitive racing. Its durable construction and compatibility with standard components make it a versatile and practical choice for BMX enthusiasts.