1. What is a SRAM Bike Tyre Pressure Calculator?

Definition: This calculator estimates the optimal tyre pressure based on rider weight and tyre characteristics using SRAM's recommended formula.

Purpose: It helps cyclists determine the ideal tyre pressure for their weight and riding conditions to optimize performance and comfort.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Tyre pressure (psi)
• \( W \) — Rider weight (lbs)
• \( F \) — Tyre factor (typically 15 for road bikes, varies by tyre type)

Explanation: The rider's weight is divided by 100 to get a base value, then multiplied by a tyre-specific factor 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 your weight in pounds and select appropriate tyre factor (default 15 for road tyres). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is tyre pressure important?
A: Proper pressure affects speed, comfort, handling, and puncture protection. It's the most important adjustment for bike performance.

Q2: What tyre factor should I use?
A: Start with 15 for road tyres, 12 for gravel, and 10 for mountain bikes. Adjust based on tyre width and riding conditions.

Q3: Should I use the same pressure front and rear?
A: Typically, use 10-15% less pressure in the front tyre as it carries less weight and improves comfort/handling.

Q4: How does tyre width affect pressure?
A: Wider tyres require lower pressures. For each 5mm increase in width, decrease pressure by about 5-10 psi.

Q5: Should I adjust for tubeless tyres?
A: Yes, tubeless tyres can typically run 10-15% lower pressures than tubed tyres for the same width.