26x4.0(100/114-559) Heavy Duty Fat E-Bike Tubes Premium Butyl Rubber Compatible with Schrader Valve 40mm E-Bike/Electric/Mountain/Fat Bike Tire Tubes-2-PCS
Condition: New
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Availability:
In Stock.
Arrives
Thursday, May 28
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Features
- Diverse Compatibility:Fits fat tire 26"x4.0"-4.5" AV40mm Schrader Valve (100/114-406),Compatible Size 26x4.0 26x4 26x4.5 for E-Bike,Electric Bike,Mountain Bike
- Durability upgrade:Made of high-quality butyl rubber,excellent resistance to ozone cracking, weathering, or aging, the tensile strength of the rubber is increased by 20%, durability by 10%, weight is reduced by 10%, and rolling resistance is decreased by 10%
- Air tightness upgrade: The custom sidewall is thickened by 20%. The thickness upgrade makes it more difficult for air pressure to leak, and the tire pressure will be maintained for a longer time and more stably.
- Even easier to inflatable: Customize extended 40mm schrader valve, common to the current models of wheels, inflatable convenience greatly increased
- Package Contents: 2 pcs 26x4.0 AV40mm Schrader Valve heavy duty bike tubes
Description
Package Contents: 2 pcs 26x4.0 AV40mm Schrader Valve heavy duty bike tubes
Brand: EXTREWIND
Valve Type: Schrader
Material: Butyl Rubber
Wheel Size: 26 Inches
Item Diameter: 26 Inches
Brand Name: EXTREWIND
Manufacturer: EXTREWIND
Warranty Description: 365 days
Included Components: 2 pcs 26x4.0 AV40mm Schrader Valve heavy duty bike tubes
Material Type: Butyl Rubber
Valve Type: Schrader
Wheel Size: 26 Inches
Compatible Tire Width Minimum: 40 Millimeters
Compatible Tire Width Maximum: 114 Millimeters
Bike Type: Mountain Bike
Item Diameter: 26 Inches
Item Width: 4 Inches
Valve Length: 40 Millimeters
Size: 26x4.0
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, May 28
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Red'd today. Packaged well. Not on bike yet but I'm sure they'll work.!
Reviewed in the United States on January 9, 2026 by Ya-Ya / Texas
Ordered these heavy-duty bike tubes to replace the tube on the front tire of my eBike and keep the other one back as a spare. Was really surprised to see the difference in the thickness and quality of these tubes as compared to the rather thin ones that came installed on the bike. Considering I live in the country and a lot of the riding we do out here involves unpaved roads and shoulders, these tubes seem like they will last a lot longer than the original tubes. Installation was easy and they are a perfect fit. After installing the front tube and going for a test ride, I could really feel the difference in the handling of the eBike and decided to install the rear tire tube as well. Have to say these are so well fitted to the nature of the eBike that I wish the manufacturer would have used these instead. Great value for the quality and will be ordering additional sets for our the eBikes that these will be compatible with.
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Reviewed in the United States on April 2, 2026 by Avanza
These tubes fit my Retrospec Koa e-bike perfectly. Installation was straightforward and the sizing matched the 26x4.0 fat tires without any issues. Once installed, they held air well and felt durable, even with the extra weight and torque that comes with an e-bike. The rubber seems thick and high quality, which gives a little extra confidence when riding on rougher terrain. If you’re looking for reliable replacement tubes for a fat-tire e-bike like the Retrospec Koa, these are a great option. They are definitely a great value.
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Reviewed in the United States on March 16, 2026 by Cyndy B.
These really deserve 4.5 stars. Finding a fat tire bike can be a hassle when you're looking for that balance between "won't pop on a thorn" and "doesn't weigh as much as the tire." These tubes are designed for the wide-rim 559mm standard. The "Heavy Duty" label isn’t just marketing. The rubber wall thickness is noticeably more substantial than the paper-thin tubes often found in stock big-box fat bikes. I fixed 2 punctures on my stock tubes already and getting a flat on a big heavy bike is not fun if you’re not equipped. These feel significantly better than the ones I replaced. A high quality valve stem with a reinforced base, important for fat bikes because low-pressure riding can cause the tire to "creep" on the rim, shearing weaker valves. It’s a perfect tube replacement and fit on my 26x x 4” tires and hold pressure steadily. Great value as a 2 pack. After I changed the punctured tube and felt the quality difference, I changed my font tube too.
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Reviewed in the United States on January 18, 2026 by Bugsy
I picked these up as backups for my fat tire electric bike, and after installing one last week, I’m genuinely impressed with the "Air Tightness" upgrade they claim. The 40mm Schrader valve is a major plus. On some fat tire rims, shorter valves can be a pain to get a pump head onto, but this extended length makes it very easy to access. The tube felt slightly lighter than my OEM tubes (the 10% weight reduction they mentioned seems accurate), but the rubber didn't feel thin or flimsy. What stands out most is the thickened sidewall. After a few days of riding on varied terrain, I haven't noticed any "seepage" or drop in PSI, which is a common issue with cheaper butyl tubes. The extra tensile strength gives me a bit more peace of mind when hitting potholes or rougher trails at higher e-bike speeds. Pros: *Excellent Air Retention: The 20% thicker sidewalls really do keep the pressure stable. *Easy Access: The 40mm valve is the perfect length for deep fat tire rims. *Great Value: Getting a 2-pack is essential for e-bike owners who don't want to be stranded. *Flexible Fit: Verified fits my 26x4.0 tires perfectly without bunching. Cons: None so far, though I’ll update this if I experience any premature "weathering" or cracking. Final Verdict: These are a step up from standard generic tubes. If you have a heavy e-bike and are tired of topping off your air every single morning, these are worth the swap.
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Reviewed in the United States on January 18, 2026 by Vanessa
These 26x4.0 inner tubes are a solid, reliable upgrade for fat-tire bikes and e-bikes, especially if you ride frequently or carry extra weight. They offer good durability, hold air well, and provide a noticeably smoother, more confidence-inspiring ride compared with thinner stock tubes. Build quality Thick, heavy-duty rubber construction helps resist punctures and pinch flats, which is especially useful on gravel, trails, and mixed terrain. The 26x4.0 sizing fits standard fat-tire rims correctly, so the tube sits evenly in the tire without awkward stretching or bunching that can cause weak spots. Performance on the bike These tubes maintain pressure well over time, so you are not constantly topping off air before every ride. The extra volume and thickness help the tires feel more stable and cushioned, which is great for e-bikes, commuters, and heavier riders. Installation experience The rubber has enough flexibility to make mounting manageable while still feeling robust once installed. Once seated properly, the valve lines up cleanly and the bead pops into place without the uneven bulges that cheaper tubes can cause. Everyday value For the price, the combination of durability, ride comfort, and reduced flat risk makes these tubes a very good value for anyone running 26x4.0 fat tires. Riders who switch from lighter, generic tubes often report fewer flats and more peace of mind, especially on longer trail or city rides.
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Reviewed in the United States on January 17, 2026 by Christopher Lakadat
Perfectly good tire as far as I can tell. It’s big. No leaks. Thick rubber, so hopefully it’s more puncture resistant than the one I’m replacing. I don’t know what tires normally cost, so I can’t speak to the value for the money. Changing it was a pain (but that’s due to the bike), so hopefully it will be a long time before I have to do it again. Do not loan your bike to friends. They won’t take care of it like you do.
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Reviewed in the United States on February 22, 2026 by Amazon Customer