1. What is a Mountain Bike Reach Calculator?

Definition: This calculator estimates the bike reach distance based on base reach, rider height, and a height factor.

Purpose: It helps cyclists and bike fitters determine the optimal reach measurement for comfortable and efficient mountain biking.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Total reach (mm)
• \( L \) — Base reach (mm)
• \( k \) — Height factor (dimensionless, typically 0.43)
• \( H \) — Rider height (mm)

Explanation: The base reach is adjusted based on the rider's height multiplied by a factor that accounts for typical body proportions.

3. Importance of Reach Calculation

Details: Proper reach ensures comfortable riding position, better control, and reduces strain on arms and back during long rides.

4. Using the Calculator

Tips: Enter the bike's base reach, height factor (default 0.43), and your height in millimeters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is base reach?
A: Base reach is the horizontal distance from the bottom bracket to the head tube without considering rider height.

Q2: Why is the height factor typically 0.43?
A: This factor represents the average proportion of height that affects reach based on human body measurements.

Q3: When would I change the height factor?
A: Adjust if you have unusually long or short arms for your height (e.g., 0.40 for short arms, 0.46 for long arms).

Q4: How do I measure my height in mm?
A: Multiply your height in meters by 1000, or in inches by 25.4 (e.g., 1.75m = 1750mm, 69" = 1752.6mm).

Q5: Does this work for other bike types?
A: The formula is specific to mountain bikes. Road bikes typically use different reach calculations.