1. What is a Gravel Bike Tyre Pressure Calculator?

Definition: This calculator estimates the optimal tire pressure for gravel bikes based on rider+bike weight, tire width, and terrain type.

Purpose: It helps cyclists find the ideal pressure for comfort, traction, and performance on mixed surfaces.

2. How Does the Calculator Work?

The calculator uses a modified formula:

Where:

• \( P \) — Recommended pressure (psi)
• \( W \) — Total weight of rider + bike (kg)
• \( W_t \) — Tire width (mm)
• \( C \) — Terrain factor (0.9-1.2)

Explanation: The formula balances weight distribution across tire contact area with terrain-specific adjustments.

3. Importance of Proper Tyre Pressure

Details: Correct pressure prevents pinch flats, improves traction, reduces rolling resistance, and enhances ride comfort.

4. Using the Calculator

Tips: Enter your total weight (including bike), tire width in mm, and select terrain type. Start with these values and adjust ±5 psi based on feel.

5. Frequently Asked Questions (FAQ)

Q1: Why lower pressure for gravel than road?
A: Lower pressures increase traction and comfort on rough surfaces while reducing vibration and fatigue.

Q2: What's a typical gravel bike tire width?
A: Most gravel bikes use 35-50mm tires, with 40mm being a common all-rounder width.

Q3: When should I use higher pressure?
A: For smoother surfaces, heavier loads, or when running tubeless setups that allow lower pressures.

Q4: How does tubeless affect pressure?
A: Tubeless tires can typically run 5-10 psi lower than tubed tires due to pinch flat protection.

Q5: Should front and rear be the same?
A: No, rear tire typically needs 2-5 psi more due to weight distribution (about 60% rear/40% front).