Specifications

Tube Size

1. Dimensions:

   • 27 x 1-1/8–1-1/4
     • Compatible with 27-inch bicycle wheels, commonly found on vintage and classic road bikes.
     • Width Range:
       • 1-1/8 inch: For lightweight, high-speed performance.
       • 1-1/4 inch: Slightly wider for increased stability and comfort, ideal for longer rides or moderate touring.

2. Applications:

   • Suited for vintage road bikes, classic touring models, and bicycles requiring precise tire compatibility.

Valve Details

1. Valve Type:

   • Presta Valve
     • Slim profile, favored in road cycling for compatibility with narrow rims.

2. Valve Length:

   • 60mm
     • Designed to accommodate deep-profile rims and ensure sufficient clearance for easy inflation access.

3. Valve Core:

   • Non-Removable
     • Permanently secured for consistent air retention and reliability.

4. Valve Stem:

   • Threaded
     • Improves grip for the pump head, minimizing slippage during inflation.

5. Valve Angle:

   • 0 Degrees (Straight)
     • Standard alignment, universally compatible with Presta-specific pumps.

Material and Construction

1. Material:

   • Premium Rubber
     • Offers excellent elasticity, resistance to air leakage, and durability against punctures.

2. Wall Thickness:

   • Standard Thickness
     • Provides a balance of durability, weight efficiency, and flexibility.

3. Construction:

   • Seamless Tube Design
     • Enhances uniformity and reduces weak points, ensuring reliability.

Performance Features

1. Tire Compatibility:

   • Compatible with tires sized 27 x 1-1/8 to 1-1/4 inches, catering to diverse road cycling needs:
     • 1-1/8 inch Tires: Prioritizes speed with minimal rolling resistance.
     • 1-1/4 inch Tires: Offers improved grip and comfort on rougher roads.

2. Pressure Range:

   • Supports inflation pressures between 80–115 PSI, depending on the tire specifications and riding conditions.

3. Air Retention:

   • High-grade rubber minimizes air loss, reducing the frequency of re-inflation.

4. Puncture Resistance:

   • Standard thickness provides resilience against typical road hazards like thorns, glass, and debris.

5. Versatility:

   • Performs well for recreational road cycling, vintage bike restorations, and long-distance touring.

Design Features

1. Valve Construction:

   • Non-Removable Core:
     • Prevents accidental tampering and ensures dependable inflation.
   • Threaded Stem:
     • Improves compatibility with pump locking mechanisms and enhances inflation stability.

2. Valve Length:

   • The 60mm stem is tailored for modern medium to deep-profile rims, maintaining functionality and aesthetics.

3. Tube Design:

   • Seamless Construction: Enhances structural integrity and ensures uniform performance.

Brand Information

1. Brand:

   • Duro
     • A globally recvintagenized brand for producing high-quality, reliable bicycle components, including inner tubes and tires.

2. Reputation:

   • Known for consistent performance and affordability, Duro products are trusted by cyclists of all levels.