Extra Load tyres are an evolution of the reinforced tyre for heavier, higher performance vehicles, allowing a lower profile tyre with extra load carrying capability. These tyres give more rigidity and enhanced road holding.
Asymmetrical tyres have a different tread pattern on each side of the tyre. This allows different patterns with differing wet/dry performance characteristics to be combined in one tyre.
Mercedes recommended tyres. These tyres have been specifically designed to compliment the performance characteristics of their vehicles.