Since the beginning of the development program of the GTC, the goal was to build the car around the driver, and create a car capable of work of any road surface. "We wanted the dynamics of the GTC was superior to the best car of the class," said Michael Harder, technical supervisor for the dynamic Opel. "We also wanted to change the setting and feel of the steering suspension than the standard Astra 5-door trim for a more precise, but always enough to remain comfortable even on the toughest streets of Europe and the United Kingdom."

Much of the development has focused on the inclusion in the GTC HiPerStrut suspension, for the first time on this abstraction. Using the same system of Insignia OPC from 239 kW/325 hp, the HiPerStrut leverages existing attacks of Astra, but it reduces the inclination of the suspension by 44 percent and the length of the upright (steering axis offset) of 46

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percent compared to models fitted with the MacPherson struts. This solution helps to prevent interference on the steering torque (steering torque) - a characteristic feature of many powerful front wheel drive cars - and allows you to exploit the performance of the GTC.

The addition dell' HiPerStrut reduces the variation of the camber on the front wheels in the corners of the GTC. It also increases steering response, due to reduced levels of friction of the steering system. Finally, the changes produced by the suspension geometry HiPerStrut allow GTC to mount on rims up to 20 inches in diameter.