Does anyone have any experience with a puncture with these tires? Did they work?

Yeah, I bought these in January and both of them were brought down by holes smaller than a pin hole. Don't waste your time on these.

What's the Psi for the inner tube

PSI is on the tire not the tube. Probably 20 to 30.

In case of a large puncture can these tubes be patched in the normal way?

I don't know, but I would think you could patch them. The tubes look and feel like a normal tube.

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2-PCS 20x4 Self-Sealing Fat Bike Tubes 20x4.0 Puncture Resistant Tubes

Product ID: 292616810

Details

Brand
YunSCM
Item Diameter
20 inches
Material
Butyl Rubber
Valve Type
Schrader
Wheel Size
20 inches

🚲20x4.0/4.5 universal fit

❄️works down to -15°C cold weather

🛡️self-sealing puncture protection

¥16423

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the Deal: Never Let a Flat Kill Your Ride!

COLD WEATHER READY PERFORMANCE - Operates reliably in temperatures as low as -15°C, so your ride never stops—even in winter.
UNIVERSAL FIT FOR FAT TIRE FANS - Fits all 20"x4.0/4.5 fat bike tires, perfect for BMX, mountain, electric, and city bikes alike.
BUILT TO LAST BUILT FOR ADVENTURE - Thicker butyl rubber design offers superior puncture resistance and durability, reducing maintenance downtime.
EASY INSTALLATION WITH SCHRADER VALVE - 32mm valve length ensures hassle-free setup and compatibility with standard pumps.
RIDE FEARLESSLY WITH SELF SEALING TECH - Automatically repairs small punctures in 5-8 seconds, keeping you rolling without interruptions.

These 2-pack 20x4.0/4.5 fat bike tubes feature self-sealing technology with pre-installed sealant that automatically repairs small punctures within seconds. Designed with durable butyl rubber and a 32mm Schrader valve, they fit a wide range of fat tire bikes including BMX, mountain, electric, and city models. Engineered to perform in temperatures down to -15°C, these tubes reduce maintenance frequency and keep you confidently riding through all terrains and seasons.

Specifications

ASIN	B08MQ4P879
Best Sellers Rank	#6,338 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #43 in Bike Tubes
Bike Type	Compatible with This Size Range of Bicycle Tires
Brand Name	YunSCM
Compatible Tire Width Maximum	45 millimeters
Compatible Tire Width Minimum	40 millimeters
Customer Reviews	4.2 4.2 out of 5 stars (921)
Included Components	2 pcs 20x4.0/4.5 AV32mm Schrader Valve Self-Sealing Fat Bike Tubes
Item Diameter	20 inches
Item Highlight	20x4.0/4.5 Fat Tire Tubes Super Automatic Repair Compatible with BMX, Mountain, Electric Bicycle Fat Tubes Schrader Valve
Item Weight	1.46 kg
Item Width	4 inches
Manufacturer	YunSCM
Manufacturer Part Number	YunSCM2020110402
Material Type	Butyl Rubber
Model Number	20x4.0/4.5
Number of Items	2
Size	20X4.0/4.5
UPC	750139075393
Valve Length	0.85 inches
Valve Type	Schrader
Warranty Description	180 days
Wheel Size	20 inches

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