1. What is a Cycle Tyre Pressure Calculator?

Definition: This calculator estimates the optimal tyre pressure based on the combined weight of rider and bike, tire width, and a pressure constant.

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 (bar)
• \( W \) — Combined weight of rider and bike (kg)
• \( W_t \) — Tire width (mm)
• \( C \) — Pressure constant (typically 15)

Explanation: The weight is divided by the product of tire width and constant to calculate recommended pressure.

3. Importance of Correct Tyre Pressure

Details: Proper tyre pressure ensures optimal rolling resistance, grip, puncture protection, and ride comfort.

4. Using the Calculator

Tips: Enter the total weight (rider + bike) in kg, tire width in mm (default 25mm), and pressure constant (default 15). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the pressure constant based on?
A: It accounts for tire construction, riding style, and surface conditions. Lower values give softer rides, higher values are for performance.

Q2: What's a typical tire width?
A: Road bikes: 23-28mm, Gravel bikes: 28-45mm, Mountain bikes: 1.8-2.5 inches (45-64mm).

Q3: When would I adjust the constant?
A: Use lower values (10-12) for comfort/rough terrain, higher values (18-20) for racing/smooth surfaces.

Q4: Does this work for tubeless tires?
A: Yes, but you can typically run 10-15% lower pressures with tubeless setups.

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