[Lifetime Warranty] 20" x 4.0" Bike Inner Tubes - Schrader Valve, Butyl Rubber - Pack of 2
Two 20" x 4.0" butyl rubber bike inner tubes with Schrader valves stacked against each other.
Infographic showing 20 x 4.0 inch bike inner tube measurements with Schrader valve compatibility.
Infographic showing wide compatibility of 20x4.0 bike inner tubes with city, mountain, gravel, and electric bikes.
Cross-section diagram of 20" x 4.0" bike inner tube showing high-density butyl rubber construction and Schrader valve.
Infographic showing 32mm Schrader valve features and tear-resistant design for 20 x 4.0 bike inner tubes.
Folded 20" x 4.0" bike inner tube with Schrader valve and puncture-resistant rubber construction.
Six-step instructional guide for installing 20 x 4.0 inch bike inner tubes with Schrader valves.
Infographic showing how to select 20x4.0 bike inner tubes with Schrader valves by tire size and valve type.
Infographic showing 20x4.0 bike tire usage scenarios for city streets, touring, and circuits.
Two 20" x 4.0" butyl rubber bike inner tubes with Schrader valves stacked against each other.
Infographic showing 20 x 4.0 inch bike inner tube measurements with Schrader valve compatibility.
Infographic showing wide compatibility of 20x4.0 bike inner tubes with city, mountain, gravel, and electric bikes.
Cross-section diagram of 20" x 4.0" bike inner tube showing high-density butyl rubber construction and Schrader valve.
Infographic showing 32mm Schrader valve features and tear-resistant design for 20 x 4.0 bike inner tubes.
Folded 20" x 4.0" bike inner tube with Schrader valve and puncture-resistant rubber construction.
Six-step instructional guide for installing 20 x 4.0 inch bike inner tubes with Schrader valves.
Infographic showing how to select 20x4.0 bike inner tubes with Schrader valves by tire size and valve type.
Infographic showing 20x4.0 bike tire usage scenarios for city streets, touring, and circuits.
Lifetime Warranty

[Lifetime Warranty] 20" x 4.0" Bike Inner Tubes - Schrader Valve, Butyl Rubber - Pack of 2

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20x4.0 Bike Inner Tubes - Schrader Valve, Butyl Rubber - Pack of 2

Key Features

  • Package Contents: Two (2) inner tubes
  • Material: High-quality butyl rubber for superior air retention and puncture resistance
  • Valve Type: Schrader (AV)
  • Valve Length: 32mm
  • Construction: Heavy-duty, increased thickness for durability
  • ETRTO Size: 89/102-406

Replaces / Cross-Reference Part Numbers

  • This product is a direct replacement for inner tubes used in tires marked with the following sizes:
  • 20 x 3.5
  • 20 x 3.6
  • 20 x 3.8
  • 20 x 4.0

Compatibility & Fitment

  • Tire Diameter: 20 inches
  • Tire Width Range: 3.5 inches to 4.0 inches
  • Valve Requirement: Fits bicycle rims drilled for Schrader valves
  • Primary Application: Fat tire bikes, electric bicycles (E-bikes)

When to Replace

  • Visible punctures, cuts, or abrasions on the tube surface.
  • Consistent loss of air pressure after inflation.
  • Tube develops a bulge or deformity.
  • Valve stem is cracked, damaged, or leaking at the base.
  • After a severe impact or pinch flat, as a preventative measure.

Installation Tips

  • Before installing, carefully inspect the interior of the tire for thorns, glass, or other sharp debris.
  • Confirm the rim strip is in good condition and correctly covers all spoke holes.
  • Lightly inflate the new tube before inserting it into the tire to give it shape and prevent pinching under the tire bead.
  • Ensure the valve stem is straight and perpendicular to the rim.
  • Seat the tire bead evenly on both sides of the rim before inflating to the recommended pressure.
  • Inflate to the PSI specified on the tire's sidewall, not on the inner tube.
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  • Optimal Pressure Retention

    Optimal Pressure Retention

    Maintains tire pressure longer, reducing the need for frequent inflation and ensuring a consistent ride.
  • Premium Quality

    Premium Quality

    Made of High-density Butyl Rubber , this inner tube resists friction, ensures long-term durability on any terrains.
  • Saving solution

    Saving solution

    BlueStars brings DIY solutions to help you deal with any trouble
  • Simple installation

    Simple installation

    Please follow our instructions in the below image or ask us for help!
EXCEPTIONAL PARTS, REMARKABLE JOURNEY

EXCEPTIONAL PARTS, REMARKABLE JOURNEY

Enjoy your seamless experience with the support of our replacement parts!
Brand
‎BlueStars
Valve Type
‎Schrader
Material
‎Butyl Rubber
Wheel Size
‎20 Inches
Item Weight
‎0.89 Kilograms
Manufacturer
‎BlueStars
Size
‎20x4.0
Item Package Dimensions L x W x H
‎9.33 x 6.1 x 3.34 inches
Package Weight
‎0.89 Kilograms
Brand Name
‎BlueStars
Warranty Description
‎2 year
Model Name
‎BlueStars 2 packs 20x4.0 Fat Tire Bike Inner Tubes
Color
‎Black
Number of Items
‎2
Style
‎20x4.0
Included Components
‎2 packs 20x4.0 Fat Tire Bike Inner Tubes

FAQ

These tubes are designed for 20-inch tires that use a 4.0-inch wide tube size. They are commonly used on fat tire bikes with tires labeled around 20 x 4.0. Check the size printed on your tire sidewall before ordering.
Inner tubes can often work across a small range of tire widths, but the best fit is when your tire size closely matches 20 x 4.0. Always verify the sizing range printed on your current tube or tire sidewall. If your tire is significantly narrower or wider, fitment may be poor and could affect reliability.
These tubes use a Schrader valve, which is the same wider valve style commonly found on car tires. That means they work with most standard bike pumps that have a Schrader-compatible head, as well as many air compressors.
Common signs include a tube that will not hold air, repeated flats, punctures, splits at the valve stem, or cracking from age. If patching no longer lasts or the tube has multiple weak spots, replacement is usually the better option.
Installation is usually straightforward for most bike owners. Basic tools are typically tire levers and a pump. Lightly inflate the new tube before installation so it holds its shape, make sure it is not twisted inside the tire, and check that the tire bead is fully seated before inflating to riding pressure. Many tube swaps take about 15 to 30 minutes per wheel.
Inspect the inside of the tire carefully for the cause of the flat, such as a thorn, glass, wire, or a sharp rim issue. Also check the rim strip or rim tape to make sure spoke holes are covered. If the original cause is still present, the new tube can fail immediately.
The most common causes are punctures from road debris, pinch flats from low tire pressure, damage from improper tire lever use during installation, worn tires, and aging rubber. Keeping the tire properly inflated and checking for embedded debris can help extend tube life.