Tubes Cycling, Outdoor Recreation, Sports & Outdoors, Tires & Tubes, Zol Zol Mountain Bike Bicycle Inner Tube 27.5″ x2.8/3.25 Presta Valve 26.5mm Review by Coyotea August 13, 2018 No Comments Made out of butyl construction Weight 240 grams Presta Valve/French Valve stem 26.5 mm long Zol road tubes are made to meet training and racing standards