Frames
The BMX Frame is probably the most important part on your BMX. Because the frame's geometrie, design and weight directly influence riding performance. In order to choose the right frame you should consider your height, weight and your BMX dicipline.
Frames FAQFrames stuff
Frames FAQ
What is a BMX Frame?
The BMX frame is the foundation of your bike, providing the structure for all other components. It's typically made from durable materials like chromoly steel (CrMo) for strength and resilience to withstand the impacts of freestyle riding. The frame's geometry significantly influences the bike's handling and feel.
What is a BMX Frame Used For?
A BMX frame is the core component of a BMX freestyle bicycle. It supports all other parts, including the wheels, handlebars, pedals, and seat. Its design and geometry directly impact the bike's maneuverability, stability, and overall performance in tricks and stunts.
What are the Essential Features of a BMX Frame?
Essential features of a BMX frame include:
- Material: High-tensile steel or chromoly (CrMo) for strength and durability.
- Geometry: Top tube length, chainstay length, head tube angle, and seat tube angle all contribute to the bike's handling and feel. Different geometries suit different riding styles and rider preferences.
- Dropouts: These are the parts where the rear wheel attaches. They should be strong and ideally accommodate different axle types.
- Bottom Bracket: The part that connects the cranks to the frame. Mid-bottom brackets are common in BMX.
- Headset: The part connecting the fork to the frame; integrated headsets are becoming increasingly popular for a cleaner look and improved strength.
How Do I Maintain My BMX Frame?
Regular maintenance is crucial for extending the life of your BMX frame. This includes:
- Cleaning: Regularly clean your frame with a damp cloth to remove dirt and grime. Avoid using harsh chemicals.
- Inspection: Regularly inspect your frame for any cracks, dents, or other damage. Replace it immediately if you find anything significant.
How Do I Install a BMX Frame?
Frame installation is best left to a professional bike mechanic, but generally involves assembling the headset, bottom bracket, attaching the fork and rear triangle, and fitting the wheels and other components. Ensure all bolts are tightened to the manufacturer's specifications.
What Size BMX Frame Do I Need?
BMX frame sizes are typically determined by top tube length. This measurement varies depending on the rider's height and riding style. Smaller top tube lengths are generally suited to shorter riders, while longer top tubes are preferred by taller riders.
Understanding BMX Frame Geometry
The geometry of a BMX frame significantly impacts its performance. Here's a breakdown of key measurements:
| Measurement | Description | Impact on Riding |
|---|---|---|
| Top Tube Length (TT) | The horizontal distance between the head tube and the seat tube. | Affects standover height and overall bike size. |
| Chainstay Length (CS) | The distance between the bottom bracket and the rear axle. | Influences wheelbase and responsiveness. |
| Head Tube Angle (HA) | The angle of the head tube relative to the ground. | Affects steering responsiveness and stability. |
| Seat Tube Angle (SA) | The angle of the seat tube relative to the ground. | Affects rider position and weight distribution. |
| Bottom Bracket Height | The height of the bottom bracket relative to the ground. | Affects ground clearance and stability. |
| Standover Height (SO) | The height of the top tube at its lowest point. | Affects ease of mounting and dismounting. |
What are the different types of BMX Frames?
BMX frames are primarily categorized by their intended use: Freestyle, Race, and Dirt Jump. Freestyle frames group into Street, Park and Flatland and are designed to withstand the rigors of tricks and jumps. Race frames prioritize efficiency and speed, while Dirt Jump frames are built for strength and durability to handle larger jumps and drops.
What does 4130 CrMo mean?
4130 CrMo refers to a type of chromoly steel, a high-strength, low-alloy steel often used in BMX frames for its strength-to-weight ratio and durability. The "4130" designation indicates the specific alloy composition, providing superior resilience to stress and impact compared to standard steel.
Are brakemounts always included along with gyro compatibility?
That depends on the frame itself. Some models are plain brakeless frames, while others feature screwable breakmounts and are gyro compatible most of the times.
