Alta Bicycle

• Outer Tire Size: 27 inches in diameter.

• Width: 1-3/8 inches (~37mm) — provides a balance between rolling efficiency and comfort.

• ISO 630: This refers to the bead seat diameter of 630 mm — make sure to distinguish this from the 700c (622 mm) wheels.

• Commonly found on:

  • Vintage English 3-speed roadsters (e.g., Raleigh, Hercules).

  • Many Schwinn road-style bicycles labeled "27 x 1-3/8".

  • Older hybrid, touring, and city bicycles from the 1960s–80s.

🛑 Note: This tire does not fit 700c (ISO 622) rims or 27 x 1-1/4 tires (which are slightly narrower but the same diameter rim).

• Minimum (50 PSI): More comfort and traction, ideal for mixed surfaces like cobbles or cracked pavement.

• Maximum (75 PSI): Firmer, faster rolling — excellent for smoother roads and light touring.

• Designed to handle both urban terrain and light-duty touring or commuting.

• Dual-performance range allows rider to adjust pressure for:

  • Rider weight

  • Terrain type

  • Ride comfort vs. speed

• Made with high-tensile steel wire embedded around the inner circumference.

• Ensures a secure, reliable fit on the rim at high PSI.

• Non-foldable — slightly heavier than Kevlar bead tires but much more durable and affordable.

• Ideal for commuting or city use where portability is less critical.

• Chevron / Herringbone Tread:

  • Diagonal “V”-shaped tread grooves resembling the herringbone pattern used in brickwork and textiles.

• Performance Characteristics:

  • Directional Stability: Channels water outward, reducing the chance of hydroplaning.

  • Low Rolling Resistance: Smooth central line enhances straight-line speed.

  • Urban Grip: Side grooves increase traction in wet conditions, cornering, or light gravel.

  • Ideal for:

    • City commuting

    • Dry-to-damp pavement

    • Park trails and crushed limestone

• Fully black profile:

  • Enhances visual compatibility with vintage and modern frames.

  • Black sidewalls are more UV- and dirt-resistant than tan/gumwall tires.

• Aesthetically neutral for both chrome and alloy wheelsets.

• ALTA is a respected brand known for value-oriented, reliable bicycle components.

• Focused on:

  • Urban commuter accessories

  • Vintage-compatible parts

  • Practical cycling gear

• ALTA tires are popular among:

  • Bicycle mechanics and restorers

  • DIY builders

  • Urban riders seeking dependable components without a premium price tag