The Big Fang was designed by Keerlon Corporation to be used by Bio Rex when he entered the Grand Prix. Although they withdrew support for him, he was able to keep the machine. The machine was designed with Bio Rex's violent tendencies in mind and as such features and incredibly tight control scheme that works well with Bio Rex's fierce reflexes. It also supports a strong body, but its boost leaves something to be desired. However, it has a high top speed.
- Number: 15
- Creator: Keerlon Corporation
- Engine: TYRANNO-28x3
- Weight: 1520kg
- Body: B
- Boost: D
- Grip: A