1. What is a Bike Tyre Pressure Calculator?

Definition: This calculator estimates the optimal tyre pressure based on the total system weight (rider + bike), tyre width, and a pressure factor.

Purpose: It helps cyclists determine the appropriate tyre pressure for their specific setup, improving comfort, performance, and safety.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Tyre pressure (psi)
• \( W \) — Total system weight (kg)
• \( W_t \) — Tyre width (mm)
• \( K \) — Pressure factor (typically 1.5 for road bikes)

Explanation: The system weight is multiplied by a factor that accounts for weight distribution and riding conditions, then divided by tyre width to determine optimal pressure.

3. Importance of Proper Tyre Pressure

Details: Correct tyre pressure affects rolling resistance, grip, comfort, and puncture protection. Too high reduces traction and comfort; too low increases rolling resistance and puncture risk.

4. Using the Calculator

Tips: Enter the total system weight (rider + bike + gear) in kg, tyre width in mm (printed on tyre sidewall), and pressure factor (default 1.5). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the pressure factor based on?
A: It accounts for weight distribution (typically 60% rear/40% front) and riding conditions (higher for racing, lower for comfort).

Q2: How do I measure total system weight?
A: Weigh yourself with all riding gear, then add your bike's weight (found in specifications or by weighing it).

Q3: When should I adjust the pressure factor?
A: Increase for racing (1.6-1.8), decrease for comfort (1.2-1.4), or for rough terrain (1.0-1.2).

Q4: Does this work for all bike types?
A: The formula works best for road and gravel bikes. Mountain bikes may need lower pressures (factor 0.8-1.2).

Q5: Should front and rear pressures be the same?
A: No, rear tyre typically needs 10-15% higher pressure due to greater weight distribution.