Hobbywing XERUN XR10 Justock G3 Spec Racing ESC The Hobbywing XERUN XR10 Justock G3 1/10 Sensored Brushless ESC is the next level in zero timing spec racing. The timing in this ESC has been fixed to a permanent 0° to comply with stock class racing. Package includes one Justock ESC.Fea..