How Are BMX Forks Measured?

BMX forks are primarily measured by their fork height, which is the length of the fork leg itself.

Understanding BMX Fork Measurement

The standard way to measure BMX fork height is to measure from the top of the crown race to the center of the drop out. This measurement essentially determines the length of the fork leg, impacting how your front end sits and handles.

Here’s a breakdown of the measurement points:

• Starting Point: The very top of the crown race. This is the point where the lower headset bearing sits on the fork crown.
• Ending Point: The center of the dropout. This is the central point of the slot or hole where your front wheel axle is secured.

Using a tape measure or ruler, you measure the straight-line distance between these two points.

Why Fork Height Matters

The height of your BMX fork has significant implications for your bike's geometry and ride feel:

• Front End Ride Height: A taller fork directly increases the height of the bike's front end.
• Steering Characteristics: Fork height affects the headtube angle, which is crucial for steering.
  • Taller Fork: Reduces the headtube angle, making it slacker or more relaxed. This often results in more stable steering, especially at higher speeds.
  • Shorter Fork: Increases the headtube angle, making it steeper. This typically leads to quicker, more responsive steering, which can be preferred for technical tricks or tight maneuvers.

Key Measurement Summary

Here's a quick table summarizing the measurement:

Understanding this measurement helps riders choose a fork that provides the desired front-end feel and handling characteristics for their riding style.