Author Tube AT-CROSS-700C Wide AV40 700x35/50C Bicycle Inner Tube (Black)

The Author Tube AT-CROSS-700C Wide AV40 is a robust bicycle inner tube engineered for 700C wheels with wide tire compatibility from 35 mm to 50 mm. Its butyl rubber construction delivers excellent air retention, keeping you rolling longer between top-ups, while the 40 mm Schrader valve ensures easy inflation at any gas station or with standard pumps. Ideal for hybrid, gravel, and cross bikes, this tube offers reliable puncture resistance for everyday riding and light off-road adventures.

Advantages

Butyl rubber material provides superior air retention and consistent performance. The Schrader (AV) valve is universally compatible with common pumps and inflation systems. Wide ETRTO range (35/50-622) covers a variety of tire widths, reducing the need for multiple spare tubes. Durable brass valve stem resists corrosion and bending, while the plastic valve cap keeps out dirt and moisture.

Suitable for

• Hybrid bicycles with 700C wheels and tires from 35 mm to 50 mm wide
• Gravel and cyclocross bikes requiring dependable tubes for mixed terrain
• Commuter and trekking bikes with wide touring tires
• Riders who prefer Schrader valves for convenient inflation

Key specifications

• Wheel diameter: 700C (28 inch)
• ETRTO size: 35/50-622
• Valve type: Schrader (AV / Auto Valve)
• Valve length: 40 mm
• Material: Butyl rubber
• Valve stem material: Brass
• Valve cap material: Plastic
• Color: Black
• Quantity per pack: 1

Recommendations

For optimal performance, pair this tube with tires within the 35–50 mm width range and check tire pressure regularly. Carry a spare tube on long rides to minimize downtime from punctures. Ensure the valve hole in the rim is compatible with Schrader valves before installation.