The first stage from Sindelfingen to the northeastern border of Switzerland runs along Autobahn 81, with the VISION EQXX occasionally slipping through the wind at up to 140 km/h. The car's low cd value of 0.5 is the result of its low weight. With its low cW value of 0.17, it offers the wind hardly any surface to attack. The world's best aerodynamics among road-legal vehicles results from the intelligent interaction of many individual measures. Starting with the basic shape of the body, which integrates the smooth-surfaced dome of the Greenhouse and flows elegantly to the rear like a drop of water. Equally advantageous in terms of low drag are the small frontal area of 2.12 m² and the reduced rear track width. It is 50 mm narrower than at the front, allowing the rear wheels to roll in the slipstream of the front wheels. The active rear diffuser, which automatically extends at 60 km/h, ensures better airflow and thus makes a significant contribution to reduced drag. The technology carrier gains further efficiency benefits from its extremely low rolling resistance tires with 4.7 per mille, which Mercedes-Benz created for the VISION EQXX together with its development partner Bridgestone. By comparison, the current EU tire label requires a rolling resistance of 6.5 per mille for the top rating in Class A. The EQS uses tires that are already well below this at 5.9 per mille. With the VISION EQXX, Mercedes-Benz is now going one step further. A striking feature is the new tire dimension 185/65 R 20 97 T, which stands for a large diameter with a narrow tread. The special Turanza Eco tires combine two innovative technologies from Bridgestone that enable greater range: ENLITEN technology reduces rolling resistance and weight by up to 20 percent. The ologic technology reduces the deformation of the tire while driving - among other things through a more tensioned tire belt. In addition, the flow transition from tire to rim was optimized in collaboration with the Mercedes-Benz aerodynamics team.
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