CAPACITY: Reads 250psi/17 bar

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Ribbed hem helps prevent slippage

Let's call it a semi-slick

E-Thirteen Helix R Crank Arms - 68-73mm and BB86-92 - 30mm - E-Thirteen Direct Mount - 170mm - Black Heavy/Bulky CAPACITY: Reads 250psi/17 bare*thirteen has lots of love for aluminium. Knowing weight, strength and looks were top priorities for riders, they went after all three with a vengeance. The Helix R is their top of the line aluminium alloy crank. Forged AL 6066 T6 arms deliver Enduro strength in XC weights and it took a 30mm Forged AL 7050 T7 spindle and massive amounts of CNC work to get there. CNC detail can be seen all over every surface for the ultimate in tech bling and weight