Available from HPI Racing are Universal Joints for Savage Monster Trucks! These universal joints are spare parts for #87230 17mm Hex Hub Conversion Set and they also convert the #87229 17mm Hex Hub Conversion Set to Universal Joint style. Universal Joints offer more efficient transfer of power to the wheels for higher speed and smoother suspension movement. Made from high strength steel for maximum durability, these are tougher than the stock dogbones and perfect for extreme driving conditions. Factory designed, factory manufactured and team tested for the best fit.