1. What is Mountain Bike Reach?

Reach is the horizontal distance from the bottom bracket to the center of the top of the head tube. It's a key measurement in bike geometry that affects how a bike fits and handles.

2. How Does the Calculator Work?

The calculator uses the reach equation:

Where:

• \( \text{Stack} \) — Vertical distance from bottom bracket to top of head tube (mm)
• \( \text{Head Angle} \) — Angle of head tube from horizontal (degrees)
• \( \text{Other Factors} \) — Additional adjustments for specific frame designs (mm)

Explanation: The equation calculates the horizontal component of the stack height based on the head tube angle.

3. Importance of Reach Measurement

Details: Reach affects bike fit and handling. Longer reach generally provides more stability at speed, while shorter reach offers quicker handling.

4. Using the Calculator

Tips: Enter stack height in mm, head angle in degrees, and any additional factors. All values must be valid (stack > 0, head angle between 0-90 degrees).

5. Frequently Asked Questions (FAQ)

Q1: Why is reach important in mountain biking?
A: Reach affects how a bike fits and handles, influencing comfort, control, and riding position.

Q2: What are typical reach values?
A: Reach varies by bike size and discipline. Modern trail bikes typically have reach values between 420-500mm.

Q3: How does reach compare to top tube length?
A: Reach is a more consistent measurement as it's not affected by seat tube angle variations.

Q4: Should I choose a longer or shorter reach?
A: Depends on your riding style and body proportions. Longer reach generally suits aggressive riding, while shorter reach offers more maneuverability.

Q5: How does reach affect bike handling?
A: Longer reach shifts weight forward for better downhill stability, while shorter reach makes the bike feel more nimble in tight spaces.