YunSCM 20 × 4.0–4.5 Fat Bike Inner Tubes – Heavy Duty, 32mm Schrader, Pair
YunSCM 20 × 4.0–4.5 Heavy Duty Fat Bike Inner Tubes
This pair of YunSCM heavy duty inner tubes fits compatible 20 × 4.0–4.5 fat bike tyres, marked ETRTO 102/114-406. Each tube has a straight 32mm Schrader valve (AV), for fat bicycles and e-bikes with matching tyre and rim specifications.
Pack contains two inner tubes. Tyres and wheels are not included.
Key features
- Heavy duty butyl and EPDM rubber construction.
- Fits compatible 20-inch fat tyres from 4.0 to 4.5 inches wide.
- Straight Schrader valves, also known as AV or car-type valves.
- A two-tube pack for replacing both tubes or keeping a spare.
Specifications
| Brand | YunSCM |
|---|---|
| Product | Heavy duty bicycle inner tubes |
| Quantity | 2 inner tubes |
| Tyre size | 20 × 4.0–4.5 inches |
| ETRTO size | 102/114-406 |
| Valve | Straight Schrader / AV |
| Valve length | 32mm |
| Material | Butyl and EPDM rubber |
| Colour | Black |
Will these inner tubes fit my fat bike?
Match the size printed on your tyre sidewall and existing tube, including the ETRTO rim diameter. This size range includes 20 × 4.0, 20 × 4.25 and 20 × 4.5 tyres with the matching 406mm rim diameter. Check that your rim accepts a Schrader valve and that a 32mm valve is long enough for the rim depth and pump connection.
Compatibility depends on the tyre size, rim and valve fit, rather than the bike brand alone. If you are unsure, contact us with a photo of the tyre markings and valve.
Fitting guidance
Inspect the tyre, rim and rim tape for damage or sharp objects before fitting. Add just enough air to give the tube shape, fit the valve straight, and take care not to trap the tube beneath the tyre bead. Inflate gradually within the limits stated for your tyre and rim.
Heavy duty tubes can still puncture. Check tyre pressure regularly and replace any damaged tube or valve.
Browse our tyres and inner tubes for other sizes.
