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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🛠️ Seal the Deal: Never Let a Flat Slow Your Hustle!

COLD WEATHER PERFORMANCE - Designed to self-seal effectively even in temperatures as low as -15°C, so your ride never stops with the seasons.
INSTANT PUNCTURE PROTECTION - Pre-installed sealant automatically repairs small holes within seconds, keeping you rolling without roadside delays.
DURABILITY MEETS CONVENIENCE - Thicker butyl rubber construction offers enhanced toughness while remaining easy to install and maintain.
HASSLE FREE REPLACEMENT SUPPORT - Quick installation plus a 180-day quality guarantee backed by responsive customer service for total peace of mind.
RIDE FEARLESSLY WITH FAT TIRE FIT - Perfectly engineered for 20x4.0-4.5" fat bike tires, ensuring a snug, reliable fit for your mountain or road adventures.

YunSCM’s 2-pack of 20" fat bike inner tubes (20x4.0-4.5") features self-sealing technology with pre-installed puncture-resistant sealant, durable butyl rubber construction, and compatibility with mountain and road fat tires. Engineered for quick automatic repair of small punctures within 5-8 seconds, these tubes perform reliably even in cold weather down to -15°C. Easy to install and backed by a 180-day quality guarantee, they’re the ultimate upgrade for proactive cyclists who demand durability and convenience.

Reviews

A**

Just as expected

I love it

24.04.2025

A**Y

Value for money

Well made heavy duty inner tubes, close inspection of seams and valve attachment show strong joints .I use them on 16x4 fat tyre e-trike and so far the pre installed anti puncture material has not been tested, but no noticeable balance issues with it.

6.11.2024

M**O

Do the job as described

I can now say officially after my first puncture they work as described. Was out on a ride, could hear tyre going down so pulled out my battery powered portable air inflator (another handy tool) and re inflated to desired psi. Off I cycled, had another 10 miles to get home and the tyre stayed up all the way so it does work thank the Lord. Obviously once not riding the tyre went down again as it needed repairing but it got me home and that's a blessing. I'd recommend highly. 👌 this was for a 20x4.0 fat tyre bike.

22.12.2023

A**D

Seller what you advertise

After replacing my tube with this new product I thought would last long without puncher or if I get puncher would self repair unfortunately after 7 months riding my bicycle I got puncher as to any tube I had to go to cyclist shop for the repair dnt bother to buy this tube the information been giving here untrue

19.03.2025

J**S

Bike tube

Good

24.09.2024

N**A

Good quality

There is definitely some liquid in it like slime

10.01.2024

G**

Excellent quality

Good product excellent quality

8.11.2023

A**M

Unbalanced feeling

I believe it’s caused by the sealant inside, the bike shakes a lot

28.08.2024

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TrustScore 4.5 | 7,300+ reviews

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Bike type	Compatible with This Size Range of Bicycle Tires
Size	20x4.0-4.5"
Material type	Butyl Rubber
Wheel size	20 Inches
Batteries included?	No
Brand	YunSCM
Manufacturer	YunSCM
Item model number	20x4.0/4.5
Package Dimensions	28.2 x 24 x 5.1 cm; 1.32 kg
ASIN	B08MQ4P879

YunSCM 2-Pack 20" Bike Inner Tubes 20x4.0/4.5 AV32mm Schrader Vavle Super Automatic Repair Self-Sealing Puncture Resistant Compatible with 20x4.0/4.5 Inch Fat Tyre Bicycle Tubes

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