Sur-Ron Electric Motorcycle Parts. Sur-Ron LBX Primary Transmission Chain Conversion Kit Upgraded DID NZ3 Chain. Sur-Ron LBX Primary Transmission Chain Conversion Kit with DID NZ3 Motocross Chain. To fit all Sur-Ron LB Models. Perfect for very sandy or muddy conditions where standard drive belt set up can slip during extreme use. Consists of front and rear sprocket plus correct length upgraded DID NZ3 Motocross chain. Check out our store for more Sur-Ron parts & goodies!