CST Ride Ambro Tire – 20 × 4.0 | E-Bike Rated (E50)

The CST Ride Ambro 20 × 4.0 is a fat tire designed specifically for e-mopeds and e-bikes, optimized for pavement and hardpack riding where durability, stability, and controlled grip are priorities.

The tire features a thick tread with deep siping and multiple gripping edges, allowing it to roll smoothly while maintaining dependable traction under acceleration, braking, and higher sustained speeds. This makes it well suited for heavier electric vehicles and daily riding on urban streets, bike paths, and compacted surfaces.

CST’s Defender compound integrates anti-puncture fibers directly into the casing, improving resistance to flats without relying on a stiff external belt. The Ride Ambro is E50 rated, approved for use on e-bikes up to 50 km/h (31 mph) and compliant with EU ECE-R75 standards, making it suitable for more demanding electric applications.

With its high volume and reinforced construction, the Ride Ambro prioritizes ride stability, load handling, and longevity over lightweight performance.

Key Features

• Designed for e-bikes and e-mopeds

• Optimized for pavement and hardpack surfaces

• Deep siping and multiple edge angles for controlled grip

• Integrated anti-puncture fibers in the casing

• Certified for higher-speed electric use (E50)

Technical Details

• Size: 20 × 4.0

• ISO: 406

• Bead: Wire

• Style: Standard Clincher

• Compound: Defender (anti-puncture fibers)

• TPI: 60

• Max PSI: 30

• Weight: 1,674 g

• E-Bike Rating: E50 (up to 50 km/h / 31 mph)

• Tread Style: Smooth / Low-Profile

• Sidewall: Non-reflective

• Color: Black

The CST Ride Ambro is a durable, e-bike-rated fat tire choice for riders who need stability, puncture resistance, and reliable performance under the added demands of electric power.