JCO5019 Aluminum 30mm x 36mm Droop BlockJConcepts set out to have a versatile, yet accurate system to add to the lineup. Spencer Rivkin was heavily involved in this project pushing the idea through as a needed accessory from the JC team. Going back to his days working with mentor Brian Kinwald, Spencer was taught the method of adjusting droop as a measurement at the axle height relative to the bottom of the chassis. The blocks are built at 36mm in height for 1: 8th off road racing, and 30mm