Schwalbe Aerothan Tube 700 x 35 50 40mm Presta Valve Shifter Style Trigger The square lugged open tread pattern The square lugged open tread pattern offers stability in loose or wet terrain while the stiff outside knobs grip at lean angles like nobody’s business Top of the line integrated brake shift lever features great ergonomics and plenty of carbon fiber and titanium hardware to save weight without sacrificing strength Puncture protection newly defined the material itself prevents sudden air loss list style position:outside