Quick Summary
The YunSCM 2-Pack Fat Tyre Bike Inner Tubes are 20 x 4.0 bicycle inner tubes with AV32mm Schrader valves. They are also described as fitting 20 x 3.5/4.0 tyres, so the key buying check is matching the tyre size and valve type to your bike.
This is a pack of 2 inner tubes for fat tyre bikes and similar bicycles that use the same size and valve specification. If you are replacing a flat tube, compare the markings on the tyre sidewall before choosing an offer.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | YunSCM, useful for matching the exact product variant. |
| Pack quantity | 2 inner tubes, so check whether you need a single tube or a pair. |
| Tyre size | 20 x 4.0, with compatibility also stated for 20 x 3.5/4.0 tyres. |
| Valve type | AV32mm Schrader valve, which needs to match your wheel and pump setup. |
What to Compare Before Buying
- Tyre size: Match the 20 x 4.0 size, or the stated 20 x 3.5/4.0 fit, with the markings on your tyre sidewall.
- Valve type: Check that your wheel uses a Schrader valve and that the 32 mm valve length suits your rim.
- Pack quantity: This is a 2-pack, which matters if you only need one replacement tube.
- Replacement fit: Confirm the tube size before fitting, especially when changing a completely flat inner tube.
Before You Decide
Confirm the 20 x 4.0 size, the 20 x 3.5/4.0 fit range and the AV32mm Schrader valve before choosing an offer. Check the tyre sidewall and make sure you are buying the 2-pack format you need.
