Quick Summary
YunSCM model YunSCM2020082102 is a two-pack of self-sealing replacement inner tubes for fat bike tires sized 26 x 4.0/4.5. Each tube has a 32 mm Schrader valve and pre-installed sealant. Match the tire size printed on the sidewall and confirm the valve fits your rim before selecting these tubes.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Quantity | Two inner tubes. |
| Fit size | 26 x 4.0/4.5; compare this with the tire’s marked size. |
| Valve | 32 mm Schrader; check that the rim accepts this valve type and length. |
| Construction | Butyl rubber with sealant pre-installed. |
| Model | YunSCM2020082102. |
What to Compare Before Buying
- Tire size: Read the size on the tire sidewall and compare it with 26 x 4.0/4.5. Do not rely on wheel diameter alone.
- Valve fit: Confirm the rim opening accepts a Schrader valve and that a 32 mm valve length works with your wheel.
- Quantity: The package contains two tubes. Check that this matches your replacement needs.
Setup and Correct Use
Before installation, check the tire’s marked size and align the tube valve with the rim’s valve opening. The product instructions advise checking the tube in water before installation; bubbles indicate damage. Handle the tube carefully around sharp objects.
Important Limitations
The pre-installed sealant is intended to address some small holes or fine leaks, but this does not establish protection against every puncture. Sealant can move inside the tube, so avoid concentrating it near the air valve while pumping. Follow the product instructions for installation and inflation.
Before You Decide
Confirm the tire size, Schrader valve compatibility and 32 mm valve length. Check that a two-tube quantity suits your needs.
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