Robust construction, carbon fiber; lightweight spring steel and aluminum alloy Carbon back plate is a pressure-formed, 3D shape that optimizes stiffness, reduces weight and leaves no shaggy edges to chip or peel 225g (w/o bash guard) Designed in conjunction with the NSMB Freeride Team, NSMB.com, and the Rocky Mountain Freeride Team Individually adjustable top and bottom guide arms Fits standard BB cups, new external BB systems and the International Standard Chain Guide (ISCG) mounting systems. No adaptors required Guides and arms can be adjusted without removing the cranks or chain guide Guide pulleys run on Enduro cartridge bearings for ultimate durability Precision tooth profiles designed to run in near silence