# How Do I Know what stem to buy?
When it comes to cycling, the bike you ride is just as important as the components that make it functional. Among those components, the stem is a critical piece of the puzzle that connects your handlebars to the bike’s frame. Understanding what stem to buy can significantly impact your riding experience, including comfort, control, and performance. Here’s a comprehensive guide to help you make an informed decision on which stem to purchase.
## Understanding the Function of a Stem
Before we discuss how to choose the right stem, let’s quickly review what a stem does. The stem is responsible for holding the handlebars in place and plays a crucial role in steering and handling. A well-chosen stem can enhance your bike’s responsiveness, provide a comfortable riding position, and absorb vibrations from the road.
## Types of Stems
There are two primary types of stems: **threaded** and **threadless**. The type you need will depend on your bike’s fork and headset design.
1. **Threaded Stems**: These are often found on older bikes and typically screw into the fork. They are adjustable in height but often have limited options when it comes to length and angle.
2. **Threadless Stems**: Most modern bikes come with threadless stems. These attach to the steerer tube of the fork using a clamp, allowing for a wider variety of adjustments in length and angle. They also tend to be more rigid and provide better steering response.
## Determining the Right Length
### Measuring Stem Length
When thinking about what stem to buy, length is one of the most critical factors to consider. Stem lengths usually range from 60mm to 150mm, and the right length depends on your body size and riding style. To determine the optimal length for you, follow these steps:
1. **Identify Your Riding Style**: If you prefer aggressive, aerodynamic riding, a shorter stem will allow for quicker handling and more responsiveness. Conversely, if you enjoy a relaxed, more upright position, a longer stem might be ideal.
2. **Physical Measurements**: Measure the top tube length of your bike; this is the distance from the saddle to the handlebars. Use this measurement to assist in determining the correct stem length.
3. **Trial and Error**: If possible, test various lengths by borrowing stems from friends or bike shops. This real-world experience can be invaluable.
### Stem Angle
In addition to length, adjusting the stem angle is another way to achieve a more comfortable, effective riding position. Stems generally come with different angles, ranging from -20 degrees to +20 degrees. Here’s how to determine the best angle:
– **Negative Angle (-)**: A negative angle stem will tilt the handlebars downward, contributing to a lower and more aggressive riding stance, suitable for racing.
– **Positive Angle (+)**: Conversely, a positive angle stem raises the handlebars, giving you a more upright position, which is essential for comfort during long rides or commutes.
## Material Choices
The stem material also affects performance, durability, and weight. Here are the common materials available:
1. **Aluminum**: Most entry-level and mid-range stems are made from aluminum. They are lightweight, affordable, and work well for most riders.
2. **Carbon Fiber**: Advanced riders often prefer carbon fiber stems. They are lighter than aluminum, provide superior vibration dampening, and are often more expensive. However, they can be less durable than aluminum in the event of a crash.
3. **Steel**: Rare but still available, steel stems are durable but heavy. They are typically found on lower-end bikes.
### what stem to buy Based on Material
– **Casual Riders**: If you are a casual rider who spends weekends on the bike or uses it for commuting, aluminum will most likely meet your needs without putting a dent in your wallet.
– **Performance Focused**: For performance-oriented cyclists, particularly in road racing or mountain biking, investing in a carbon stem may enhance your experience.
## Stem Clamp Diameter
Another critical factor when trying to decide what stem to buy is the clamp diameter, which comes into play when attaching the stem to the handlebars. Stems typically fit handlebars sized either 25.4mm, 31.8mm, or 35mm.
### Choosing the Right Clamp Size
– **Measure Your Handlebars**: Before purchasing, ensure you’re familiar with your handlebar size. This will guarantee compatibility with the new stem.
– **Upgrade Considerations**: If you’re considering upgrading your handlebars along with your stem, you may wish to opt for the 31.8mm or 35mm sizes, which tend to provide more stiffness.
## Aesthetic Considerations
While performance is paramount, aesthetics can also play a part in your selection. Many riders want their components to match or complement the bike’s color scheme. Manufacturers often provide a variety