Duro 26x 1 3/8 Bicycle

DURO 26 x 1 3/8 Thorn Resistant Bicycle Inner Tube – 33mm Schrader Valve, Removable Core.

• Item Type: Bicycle Inner Tube

• Tube Size: 26 x 1 3/8

• Width Equivalent: 1.375 in

• Construction: Thorn-resistant / heavy-duty butyl rubber

• Designed Use: Street, cruiser, and vintage bicycle applications

• Brand: DURO

• Valve Type: Schrader (car-style valve)

• Valve Length: 33mm

• Valve Angle: Straight (0°)

• Valve Core: Removable

• Valve Stem Finish: Smooth

✔ Compatible with most standard bicycle pumps designed for Schrader valves
✔ Removable core allows easier service and sealant compatibility (where applicable)

• Fits Tires Marked: 26 x 1 3/8

• This tube is intended ONLY for bicycles using 26 x 1 3/8 tires, which are NOT the same as 26 x 1.75, 26 x 2.0, or standard MTB 26" tires.

26 x 1 3/8 tires exist in two different rim standards:

• ETRTO 590 (650A)

• ETRTO 597 (Schwinn / S-6 / EA3)

➡️ Buyer must confirm the ETRTO number printed on their tire sidewall before purchasing.
This tube is designed specifically for 26 x 1 3/8 applications—matching the correct ETRTO size is essential.

• Vintage and classic cruiser bicycles

• Older Schwinn-style cruisers using 26 x 1 3/8 tires

• Select vintage roadster and city bikes equipped with 26 x 1 3/8 (650A or Schwinn-type) wheels

• Middleweight and heritage bicycles originally designed around narrow 26" rims

(Not compatible with modern 26" mountain bike wheels)

• Thicker rubber construction compared to standard tubes

• Helps reduce punctures caused by:

  • Thorns

  • Glass

  • Road debris

• Ideal for riders prioritizing durability over ultra-lightweight performance