There's a reason this is CST's most popular bicycle tube: a proven, general-purpose design that simply gets the job done. This 20 x 1.9/2.125 tube has a 0.97 mm wall and a 40 mm Schrader (American) valve.

Highlights

  • CST's most popular general-purpose tube
  • 0.97 mm wall thickness
  • Rubber and high-grade butyl construction
  • Schrader (American) valve, 40 mm long

Proven and practical

It is made with rubber and high-grade butyl to improve flexibility and puncture resilience. It is the tube CST recommends for everyday, general-purpose riding, and a straightforward swap for a worn or punctured tube.

Compatibility & fit

Fits tyres marked 20 x 1.9/2.125. Check the size printed on your tyre's sidewall, and make sure your rim's valve hole and your pump head suit a Schrader valve. Our workshop can fit tubes and tyres for you.

Covered against manufacturing defects in materials and workmanship. Normal wear, punctures and damage from incorrect fitting or inflation are not manufacturing defects. For warranty support, return the product to Tune Cycles and we'll manage the claim with KWT Imports, CST's Australian distributor.
  • CST's most popular general-purpose tube
  • 0.97 mm wall thickness
  • Rubber and high-grade butyl for flexibility
  • 40 mm Schrader (American) valve
  • Sized for 20 x 1.9/2.125 tyres
ModelCST Standard Tube
Tyre size20 x 1.9/2.125
Wall thickness0.97 mm
ValveSchrader (American)
Valve length40 mm
MaterialRubber and high-grade butyl
SKU KWT-CT20SV
Brand CST
Shipping Weight 0.2500kg
Shipping Width 0.160m
Shipping Height 0.060m
Shipping Length 0.220m