And here is what Surly has to say:
Surly Inner Tube to fit a wide range of plus-size and fat bike tires.
- Shaft Type: Threaded
- Valve Core: Removable
- Tube Compound: Butyl
- ISO Diameter: 559 / 26″ mtn
- Tire Size: 26 x 3.0, 26 x 3.5, 26 x 3.8, 26 x 4, 26 x 4.25, 26 x 4.5, 26 x 4.6, 26 x 4.7, 26 x 4.8
- Valve Length: Short 32-40mm
- Weight: 310 g
- Thickness: 0.8mm
- WARNING: Handling this product will expose you to chemicals, including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For further information go to www.P65Warnings.ca.gov.