And here is what Teravail has to say:
The Teravail Standard Schrader and Presta Valve tubes feature our widest variety of tube sizes and valve lengths with a proven record of high quality control and consistent availability.
Shared Specs for All Sizes:
- ISO Diameter: 584 / 650b / 27.5″TN
- Wall Thickness: 0.9 mm
- Schrader Shaft Type: Smooth
- Presta Shaft Type: Threaded
- 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.
27.5″ x 1.5-1.95″
- ISO Width: 38-50mm
- Weight w/Presta Valve: 83g
27.5″ x 2.0-2.4″
- ISO Width: 50-61mm
- Weight w/Schrader Valve: 250g
- Weight w/Presta Valve: 225g