Zol Mountain Bike Bicycle Inner Tube 27.5″ x2.8/3.25 Presta Valve 48mm Review Posted on May 4, 2019 By DuskunkTagged Cycling, Outdoor Recreation, Sports & Outdoors, Tubes, Zol Made out of butyl construction Weight 240 grams Presta Valve/French Valve stem 48 mm long Zol road tubes are made to meet training and racing standards