Schwalbe SV13J, 26"Presta, Fatbike Inner TubeMTB fatbike tube for Schwalbe Jumbo Jim fatbike tire with Presta valve (french valve). Weighs just 390g! Extreme air pressure stable! The rubber compound makes it possible: less air leakage and less to pump. Extremely reliable! Quality control for safe riding pleasure: each Schwalbe tube is checked twice on air retention in the factory.