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Description
20" x 4.0" Bike Inner Tubes - Schrader Valve, Butyl Rubber - 2 Pack20x4. 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
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
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Product Reviews
★★★★★ 5
Very nice dress shirt, good fitting.
Good quality shirts. The shipment came quickly and fit perfectly.
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Reviewed in the United States on December 29, 2025
★★★★★ 5
No need to iron
Perfect fit
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Reviewed in the United States on March 24, 2026
★★★★★ 5
Great shirt
Color: Black, Size: Medium
Great shirt for the price. Thin but comfortable. True to size.
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Reviewed in the United States on November 28, 2025
★★★★★ 5
Very well made Oxford casual shirts.
Size: X-Large, Color: Sky Blue
I've ordered 8 of these Button-down collared, long sleeved Oxford shirts in eight different colors. I'm 6', weigh 195. And have a 44" chest and fairly broad shoulders. The XL give me ample room, plenty of shirt tail to tuck in. And are well made. The shirts have a nice soft feeling to them. If you wash them with like items, and dry them likewise, taking them out before the cycle ends and hanging them. You won't have a single wrinkle. The shirts are true to color, and true to size if you follow the size guideline. These are not tailor fit, but regular fit shirts. Fabric quality seems very durable and well made. There is no smell when receiving the shirts. No more so than buying a shirt at a retail store. They do come in a vacuum bag. The shirts are a little heavier than a poplin shirt and can be worn year-round. These are great casual shirts for jeans and a sport coat, or slacks. I like the quality and the colors. I also like the thickness of the shirts. All of the shirts I've bought, black, blue, etc, have white buttons. Which makes them more of a casual shirt. But well worth the price.
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Reviewed in the United States on November 10, 2025
★★★★★ 5
Win Win Shirt no need to think on purchase.
Size: XX-Large, Color: Light Pink
Beautiful shirt. true to size. perfect and cost are spectacular. trust me from a guy that bought many expensive shirts, this will deliver perfect fit and at the cost a double win.
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Reviewed in the United States on May 21, 2026