Author Tube AT-MTB-27.5 AV40 27.5x1.75/2.35 Bicycle Inner Tube (Black)

With a 40 mm Schrader valve and a width range of 1.75 to 2.35 inches, this 27.5-inch tube is a dependable choice for mountain bikers who demand consistent air retention and easy inflation on the trail.

Overview

The Author Tube AT-MTB-27.5 AV40 is a butyl rubber inner tube engineered for 27.5-inch (650B) mountain bike wheels. It accommodates tire widths from 1.75" to 2.35", making it versatile for a range of MTB tires. The straight Schrader (AV) valve is 40 mm long, providing ample clearance for deep-section rims. A removable valve core allows for easy maintenance or the addition of sealant. The tube comes with a valve cap to keep the core clean and protected.

What stands out

• 40 mm Schrader valve for deep rims and easy inflation
• Wide tire compatibility: 1.75" to 2.35"
• Butyl rubber construction for excellent air retention
• Removable valve core for maintenance or sealant
• Includes valve cap for protection

Technical details

• Wheel size: 27.5 inches (650B)
• ETRTO size: 44/60-584
• Valve type: Schrader (AV / Auto Valve)
• Valve length: 40 mm
• Valve angle: Straight
• Valve core: Removable
• Valve stem material: Brass
• Valve cap included: Yes
• Material: Butyl rubber
• Color: Black
• Intended use: Mountain bike (MTB)
• Puncture resistance: Standard
• Packaging: Single unit

Our verdict

A reliable, no-nonsense inner tube that covers the most common MTB tire widths. The 40 mm Schrader valve is a practical length for many trail rims, and the removable core adds flexibility for riders who use tubeless sealant or prefer easy maintenance.