stock hubs. I am basically afraid of the trigger when i drive this truck. It is fine indoors. If I mainly raced at the local indoor, it would be fine. But on the outdoor track I run on 90% of the time, its horrible. Worst rc I have ever driven. And I have owned a few over the years. It kinda feels too light. Any power at all and all 4 wheels spin. What is the most weight people have added? I have 2oz up front right now.