Optimus Tire Casing:Trail Check out our updated Helix

Check out our updated Helix Core rings here: Helix Core e*spec Chainrings

ALL e*thirteen Cassettes utilize two-piece construction

The Optimus' tread pattern was engineered with shorter

This center knob configuration also helps to provide a more predictable feel and consistent traction when transitioning from straight-line to aggressive cornering angles

Optimus Tire Casing:Trail Check out our updated HelixThe Optimus 2. 4" is designed to deliver confidence inspiring trail traction with lower roll resistance at XC Down Country weights. The 2. 4'' high volume design promises the comfort of burlier trail tires and the same ability to run lower air pressures, but a tread and casing configuration that targets maximum rolling efficiency . The Optimus features e*thirteen's Endurance compound, with a firm base layer and center knobs, and softer medium tack