Passenger cars endure side impact collisions which can quite prove fatal from the point of the availability of lesser crumple zone. Side impact beam (SIB) is equipped in passenger cars and other ground vehicles as a safety structural member. SIB strengthens the doors of the vehicles and lowers the risk factor in side collisions. This paper presents the parametric studies carried out on the side impact beam (SIB) tube. Material, outer diameter and thickness of the tube are the main parameters which can change the load carrying capacity and energy absorption characteristics of an SIB tube. In this regard, to improve the load carrying capacity and energy absorption characteristics it is beneficial to study the effect of each parameter on SIB tube. The proper combination of these parameters may improve the overall structural behavior of the tube. A Finite Element (FE) model using LS-DYNA has been developed for carrying out the parametric studies.