Primo Richter Solid Guard SprocketNate Richter's signature Primo sprocket comes with an integrated sprocket guard all machined from one piece of aluminium. The Primo Richter Guard Sprocket is fully CNC machined from one piece of 6061 T6 aluminium so it's insanely strong and durable, that integrated guard adds protection to your cranks and chain when you're having a ledge session. Two sprocket bolt holes allow the Richter Sprocket to be rotated once one side has taken too much damage