XRAY have introduced new molded composite steering block and rear upright for the XB4. These parts are made from specially-formulated graphite composite material for maximum strength, perfect for high-traction conditions. The parts give a perfect balance between reliability and performance and make the car more stable and increase cornering speed. For maximum drivetrain reliability, larger 5x12mm ball-bearings are used in the outer position with increased dynamic load. On the inner position, smaller 5x10mm ball-bearings are used to minimize unsprung weight.