BMX Frames

Understanding BMX Frames

The frame of a BMX bike is not only the largest component of your setup but also the most costly. It greatly affects your riding style and how you advance as a rider. While both freestyle and BMX racing frames share the classic diamond design, race frames are designed longer to ensure enhanced stability.

For freestyle BMX bike frames, the emphasis is on having a robust and strong frame capable of enduring significant impacts. Therefore, these are generally crafted from steel. In contrast, race frames are designed to be extremely lightweight and are often made from aluminium.

What Size BMX Frame Should I Choose?

Frames are available in a variety of sizes. Your frame size choice is largely down to personal preference, but a general guideline is that taller individuals should opt for larger frames.

Usually, frame sizes are indicated by the length of their top tube, with freestyle frames using inches for this measurement. Race BMX frames, meanwhile, are categorised into “frame names,” ranging from Mini to Pro XXXXL.

In addition to top tube length, the angle of the headtube is another detail to note as it can change the overall feel of the bike. A sharper angle brings the front wheel closer, facilitating front-end tricks. A more relaxed angle positions the wheel further away, providing better control at higher speeds. If you are unsure of your preference, the industry standard, between 74° and 76°, offers a neutral setting.

Exploring the BMX Chainstay

The BMX chainstay refers to the distance from the centre of the bottom bracket to the centre of the rear axle. The axle can be inserted fully into the rear dropout (termed as slammed, reflecting the shortest possible chainstay) or positioned at the middle of the dropout (centred). The chainstay is a crucial element of your frame and affects your bike’s handling characteristics. Chainstay lengths generally range from 12 to 14 inches.

Park and street riders who desire a more responsive setup, enabling fast spins and sharp turns, tend to opt for a shorter chainstay. Trail riders, on the other hand, favour a longer rear end for extra stability and control.

If considering chainstays has inspired you to think about a new chain, browse through our BMX Chains to see if anything catches your interest.