Pirelli is one of the main tire manufacturers in the world, leader in the supply of original equipment tires for the prestige passenger car sector. This thesis is the product of a specific research activity performed by the R&D department of the Settimo Torinese industrial plant, aimed at detecting the influence on tire static and dynamic behavior of selected design leverages. This study in particular deals with the effects of the bead filler on the most relevant tire parameters, in particular the attention will be focused on material and geometry variants. These design leverages are currently used as a tool to modify the tire structural stiffness in order to reach the performance target required by the customer.