With all the growing number of options for wheel sizes and tire widths, it's probably a good idea to stock up on your plus tube size of choice just in case the small shop by the trailhead is out of stock. Be prepared and get back on the trail in a flash with the Vittoria MTB Lite 27. 5in Plus Tube. Made from standard butyl, this tube is compatible with tires ranging from 3 to 3. 5in wide and includes a 48mm Presta valve stem.