Throne Cycles Cranks for The Goon 29" BMX 3pc Crank and TRKLRD Single Speed Bike Crankset. Also, Have Parts for The 3pc Crankset, Crank Arms, and Hex Bolt. (Goon Crank Arm)Our stiff one-piece forged alloy black crankset is lightweight and strong enough to handle daily riding and commuting. A solid upgrade guaranteed and matched for any square taper..