Ultra Racing Toyota Avanza (F600) 1.3 1.5 2WD 03 18 UltraRacing 2 Point Room Bar (1387) UR RO2 1387 El Parque Nacional Cerro Azul Membar (Panacam). The chassis of the car is the part which experiences the most of the abuse from the driver. It is particularly due to the weight transfer of the vehicle body during fast cornering, hard braking or hard acceleration. In some instances, the weight transfer during cornering may cause one side of the vehicle to experience as much as 3 times more force than the other side of the vehicle, causing enormous chassis flex vehicle body deformity and twist, consequently causing tires to lose grip. Deformity and twisting of the vehicle chassis during cornering may cause negative handling traits such as understeering and oversteering. That's where Ultra Racing comes in.