Closure or Slip-on: They feature a slip-on closure which is tailored to accommodate a training watch

which drops a whopping 100g of weight from the older models

1x hex key

and a helmet loop to keep your helmet secure while not riding

5°/ 6 Pawl

E-Thirteen Helix R Guidering Direct Mount Chainring - E-Thirteen Direct Mount - 30T - 52-55mm Flip - Round - 12-Speed - Grey Alloy Envelope Shipping Closure or Slip-on: They featureAccording to E*Thirteen, the Helix R Direct Mount Chainring is a game changer. With proven Sram and Shimano 11 or 12 speed cross compatibility applied to an ultra lightweight, durable AL 7075 t6 Chainring and a highly CNCD technical finish. Combine with the chain, derailleur shifter of choice without a change in chain retention quality. Build a dream rig with more freedom and spec creatively. One of the strongest and most durable alloys available, AL