SPECIFICATIONS

• Size: 27 x 1 1/4 (also written as 27 x 1.25)

• ISO (ETRTO): 630 mm (Bead Seat Diameter)

• Compatible Rims:

  • Standard 27" road/touring rims

  • Schwinn S5 and S6 rims – these proprietary rims require special sizing attention; this tire is designed to fit both traditional 630mm 27" rims and vintage Schwinn S5/S6 steel rims when used with appropriate inner tubes.

• Inflation Pressure:

  • Max PSI: 75

  • Designed for high-pressure performance, allowing for reduced rolling resistance and greater road speed.

🏁 TREAD PROFILE

• Tread Model: HF-156

• Tread Name: Zigzag Glider / Zigzag Touring Tire

• Tread Design:

  • Smooth centerline for low rolling resistance on pavement.

  • Zigzag tread along shoulders improves grip during cornering and in mildly wet conditions.

  • Semi-slick configuration – ideal for urban, paved, and light recreational surfaces.

• Performance Character:

  • Efficient on long road rides, commutes, and fitness rides.

  • Minimal noise and vibration on smooth pavement.

  • Offers a balance between speed and controlled handling.

🛠️ CONSTRUCTION & MATERIAL

• Bead Type: Wire Bead

  • Durable steel wire bead ensures a secure fit on the rim.

  • Less flexible than folding beads, but offers superior value and structural integrity.

• Style: Standard Clincher

  • Requires a tube.

  • Universally accepted for most vintage road bikes with ISO 630 rims.

• Material: High-Durability Rubber Compound

  • Designed to resist wear and cracking, particularly important for restoration or daily commuter builds.

  • Lightweight casing balances strength with road feel.

🎨 COLOR

• Tread Color: Black

• Sidewall: Gumwall

  • Classic gumwall design gives a clean and versatile appearance.

  • Pairs well with both chrome and painted rims on vintage and modern builds alike.

🚲 COMPATIBILITY

• Fits Bikes With:

  • 27-inch wheels (ISO 630)

  • Vintage Schwinn S5/S6 wheels, often found on Schwinn bikes from the 1960s–1980s like:

    • Varsity

    • Continental

    • Suburban

    • Speedster

    • Collegiate

• Not Compatible With:

  • 700c wheels (ISO 622) – even though similar in diameter, the bead seat diameter differs.

• Inner Tube Recommendation:

  • Use a 27 x 1 1/4 tube, or specific Schwinn S5/S6 tube depending on the rim (typically a slightly wider bead profile).

🌍 BEST USES

• Urban commuting – fast and low-effort rolling

• Fitness riding – efficient and stable for extended rides

• Touring and light riding– dependable for older bikes used in longer road tours

• Classic bike restoration – period-correct appearance and size for vintage projects