Inner ring is high strength ultralight 7075 T6 aluminium. The outer ring is chemically nickel plated steel.
Exterior is extended at 200 C and then fitted to the interior, giving a permanent bond for the life of the sprocket.
CNC precision machined to extremely tight tolerances. Product Description
Flat hex socket screws add extra force to the chainwheel in the event of a side impact. Self-cleaning mud grooves between each tooth on both sides prevent dirt deposits. Available for most popular dirt bicycles.