Shopping Cart

Your cart is empty.

Your cart is empty.

BlueStars Heavy-Duty 20x4.0 Bike Inner Tubes with Schrader Valve - Thicker Butyl Rubber, Ideal Replacement for Mountain Bikes & E-Bikes with 20-inch Tires - Pack of 2

4.8 (1) Write Review
Free shipping on orders over $29.99

$16.99

$ 7 .99 $7.99

In Stock

About this item

  • Thicker Butyl Rubber: BlueStars inner tube features a sidewall thickness of 1.05mm, thicker than the standard 0.75~0.98mm, offering superior puncture resistance and better air retention. The thick butyl rubber also absorbs shocks, reducing the impact of bumps and uneven terrain, providing a more comfortable ride.
  • Puncture-Resistant Design: The tubes are engineered with reinforced rubber to withstand punctures from sharp objects, offering better protection against flats. Ideal for urban and off-road riding, the puncture-resistant feature ensures a smoother, more reliable ride.
  • Compatible with 20x3.0 Tires: Specifically designed to fit 20-inch tires with a 4.0-inch width, BlueStars Schrader Valve Inner Tube is ideal for mountain bikes, gravel bikes, city bikes, and electric bikes, providing a seamless fit and reliable functionality for a smooth, uninterrupted ride.
  • Standard Schrader Valve for Easy Inflation: Features a reliable Schrader valve, making it compatible with most standard bike pumps and providing an easy inflation process. The valve is designed for secure attachment and consistent air pressure.
  • Enhanced Air Retention for Longer Rides: Built to retain air for extended periods, reducing the frequency of necessary inflation and maintaining optimal tire pressure, ensuring better performance, control, and comfort throughout your ride.
  • 100% LIFETIME PROTECTION: Enjoy reliable performance with our lifetime protection, ensuring that your product will always be covered for any defects or issues that may arise.


BlueStars 2 packs 20x4.0 Fat Tire Bike Inner Tubes


Lars A. Morgan
Reviewed in the United States on July 8, 2025
Call this a 3.5 star review.Nice pair of inner tubes, though I've only used one so far a part of a replacement/upgrade to the front tire on my etrike. These were held together with a rubber band (yay, no cutting) and went around the rim easily. Inflated to 20 psi without incident, and was the easiest part of the tire change. Would it have been that for the actual tire, but thats another story.Decent and thick tubes, which is always a plus in my book - I live in the desert southwest and everything here hates bike tires. Thorns, nails, fangs, you name it it wants to pop the tire. Thicker harder compound tires, TPU liners and self sealing inner tubes are no match, so I just get the heaviest I can get and hope for the best.Can recommend these - if the mounted one gets a flat too easily, I'll update the review.