Chromoly Tubing For Motorcycle Frame

The Perfect Thickness of 4130 Chromoly for Your Motorcycle Chopper Frame

Navigating the World of ERW and DOM Tubing

When it comes to building a custom motorcycle chopper with a pro-street style, selecting the appropriate thickness of 4130 Chromoly for the frame is crucial. Motorcycle frames are commonly constructed using both Electric Resistance Welded (ERW) tubing and Drawn Over Mandrel (DOM) tubing. ERW tubing is ideal for small engines with limited horsepower, while DOM tubing provides greater strength and durability.

4130 Chromoly: The Material of Choice

4130 Chromoly is an alloy steel that combines chromium and molybdenum, offering exceptional strength and weight-saving properties. It's a popular choice for motorcycle frames due to its ability to withstand high stresses and vibrations.

Factors to Consider

The thickness of 4130 Chromoly you choose will depend on several factors: * **Engine Power:** The horsepower of the engine will determine the amount of stress placed on the frame. Thicker tubing is required for more powerful engines. * **Riding Style:** Aggressive riding styles and frequent jumps demand a stronger frame, necessitating thicker tubing. * **Frame Design:** The design of the frame, including the geometry and tube angles, influences the required tubing thickness.

Common Thicknesses

For pro-street style chopper frames, the following 4130 Chromoly tubing thicknesses are commonly used: * **1.00 inch x 0.120 inch:** Provides ample strength for engines up to 100 horsepower. * **1.25 inch x 0.120 inch:** Suitable for engines with horsepower ranging from 100 to 150 horsepower. * **1.50 inch x 0.120 inch or 0.156 inch:** Ideal for high-powered engines above 150 horsepower or for aggressive riding.

Conclusion

Selecting the appropriate thickness of 4130 Chromoly for your motorcycle chopper frame is essential for ensuring both strength and durability. By considering the engine power, riding style, and frame design, you can make an informed decision that will result in a frame that meets the demands of your custom build.