Specialized Presta & Schrader Bike Tubes Product Details Our Standard Schrader and Presta Valve Tubes feature a molded method of construction that ensures a consistent thickness of butyl rubber. This means that they don&';t have any unnecessary weight and will roll smooth, ride after ride. Presta Mountain Mullet Tube One tube to rule them all!Are you riding a mixed wheel size mullet bike? Can&&';;t decide to bring a 27.5" or 29" spare? Or do you just want to be a trail hero saving others with your versatile tube that fits both 27.5" and 29"? The new MTN MULLET tube takes the guess work out of which size tube you should pack. At the drop of a hat, this tube is ready to take care of business up front or ride the party in the back. 40mm Presta Valve Tube weight: 220g Tube weight: 220g