Specifications

Tube Size

1. Dimensions:

   • 27 x 1-1/8–1-1/4
     • Designed for bicycles with 27-inch wheels, a common size for vintage road bikes and classic touring bicycles.
     • Width Range:
       • 1-1/8 inch: Narrower option for faster, lightweight riding with minimal rolling resistance.
       • 1-1/4 inch: Slightly wider for added comfort and stability on uneven surfaces.

2. Application:

   • Optimized for vintage-style road bikes and touring bicycles, providing a snug and reliable fit for tires within the specified size range.

Valve Details

1. Valve Type:

   • Presta Valve
     • Commonly used on road bikes and performance-oriented bicycles.
     • Narrower diameter than Schrader valves, making it ideal for rims with smaller valve holes.

2. Valve Length:

   • 33mm
     • Shorter valve length, ideal for standard-depth rims without excessive protrusion.

3. Valve Core:

   • Non-Removable Core
     • Provides a secure, air-tight seal while reducing potential maintenance needs.

4. Valve Stem:

   • Threaded Stem
     • Facilitates secure attachment of a pump head and helps prevent slippage during inflation.

5. Valve Angle:

   • 0 Degrees (Straight)
     • Standard alignment, ensuring compatibility with most Presta-compatible pumps and inflators.

Material and Construction

1. Material:

   • Premium Rubber
     • Ensures excellent air retention and durability, making the tube suitable for long-term use.

2. Wall Thickness:

   • Standard Thickness
     • Strikes a balance between weight savings and puncture resistance.

3. Construction:

   • Seamless Tube Design
     • Minimizes weak points, providing uniform performance and enhanced reliability.

Performance Features

1. Tire Compatibility:

   • Fits 27-inch tires with widths ranging from 1-1/8 inch to 1-1/4 inch:
     • 1-1/8 inch Tires: Optimized for road cycling with high-pressure ratings of 90–115 PSI.
     • 1-1/4 inch Tires: Suitable for touring and recreational cycling, supporting pressures of 80–100 PSI.

2. Air Retention:

   • The rubber material offers excellent air retention, requiring less frequent reinflation.

3. Puncture Resistance:

   • Standard tube thickness resists minor punctures and abrasions, ensuring dependable performance.

4. Versatility:

   • Suitable for vintage bicycles on paved roads, light gravel paths, or recreational routes.

Design Features

1. Valve Construction:

   • Non-Removable Core: Offers consistent air pressure maintenance with minimal user intervention.
   • Threaded Stem: Ensures a secure connection with the pump and prevents slipping during inflation.

2. Seamless Tube:

   • Provides a smoother and more uniform performance, reducing risks of blowouts or uneven inflation.

3. Compact Valve Length (33mm):

   • Designed to suit standard rims, providing a clean and professional look.

Brand Information

1. Brand:

   • Duro
     • A trusted manufacturer in the cycling industry, known for producing reliable and durable inner tubes.

2. Reputation:

   • Well-regarded for delivering affordable and high-quality products for various cycling applications.