The arms are engineered are manufactured in our British Columbia, Canada manufacturing facility. New for 2012: Chainring tab thickness has been increased to 4.5mm. CrMo pedal inserts eliminate the potential of stripped thread. Removable granny spider for better chainguide integration. This crankset is completely hollow with all unnecessary material being removed from the centre core. The composite arms have no internal aluminum spine. 3mm of chainline adjustability ensures the ability to achieve perfect drivetrain alignment even with difficult suspension frame designs and ideal for fine tuning shifting chainguide set ups. Only Race Face cranks offer this extremely useful feature. Race Face chainrings are 100% CNC machined from super hard 7075 aluminum to maximize wear resistance impact strength. Proven assembly friendly EXI spline interface ensures fast, simple installation and easy dealer serviceability using standard shop tools. SIXC features a specifically engineered, superlight, CNC machined CrMo BB spindle that is permanently moulded directly into the drive side crank arm to minimize weight and maximize power transfer. All alloy T 30 Torx hardware keeps weight down and coolness high. Crank bolt puller cap makes crank removal a snap with just an 8mm hex wrench.