The optimal tire pressure for an electric bicycle depends on several factors, including the type of bike, the type of tires, the rider's weight, and the terrain. However, here are some general guidelines:

1. Mountain E-Bikes (MTBs): Typically, mountain bike tires require lower pressure for better traction and shock absorption. The optimal range is usually between 30-50 psi (2-3.5 bar).

2. Road E-Bikes: These bikes have narrower tires that require higher pressure for reduced rolling resistance and better speed. The optimal range is usually between 80-130 psi (5.5-9 bar).

3. Hybrid/Commuter E-Bikes: These tires fall somewhere in between mountain and road bike tires, generally needing a pressure range of 50-70 psi (3.5-5 bar).

4. Fat Tire E-Bikes: These bikes are designed for off-road and difficult terrains, often requiring very low pressures to provide the best traction and comfort. The optimal range is typically 15-30 psi (1-2 bar).

Factors to Consider:

• Rider's Weight: Heavier riders might need slightly higher tire pressures to prevent pinch flats and maintain stability.
• Terrain: For off-road or uneven terrain, lower pressure provides better traction and comfort. For smooth roads, higher pressure improves efficiency and speed.
• Tire Size and Type: Different tires have different optimal pressure ranges. Always refer to the tire sidewall for manufacturer recommendations.

Practical Tips:

• Check Regularly: Tire pressure can change with temperature and time, so it’s good practice to check it regularly.
• Use a Quality Pump: A pump with a pressure gauge can help you achieve the optimal pressure accurately.
• Adjust as Needed: Experiment within the recommended range to find what feels best for your riding style and conditions.

For precise recommendations, always refer to the tire manufacturer’s guidelines as marked on the tire sidewall.