The Stans NoTubes Tyre Sealant started a tubeless revolution. Inside this simple black bottle is a product that changed cycling. Today s tubeless systems rely on the lighter, more reliable, self-sealing performance of Stan s Tyre Sealant.First choice of riders around the world for tubeless conversion and flat preventionSeals punctures up to 1/4 (6.5mm) quicklyStays liquid 2-7 months for long-lasting protectionPremium low-viscosity formula resists freezing to work in environments as cold as -30° F (-34° C)Natural materials, safe for the environmentCan be injected through valve stems with removable cores compatible with tubes and tubular tyresJust two ounces of Stan s in a converted standard tyre or tubeless tyre can repair punctures up to 1/4 almost instantly to keep you rolling. Longer-lasting Stan s Tyre Sealant is formulated to stay liquid in tyres with even thin casings for up to seven months. Arid conditions require more frequent monitoring of sealant levels, but anti-freezing ag