The chassis is raised at the front and rear to accommodate the movement of the axles and wheels during springing. This also helps keep the chassis height low. The spars are connected in such a way that the frame narrows at the front. This is to have a smaller turning radius and better steering lock. Mounting brackets are provided on the sides of the side members to support the bodywork. Iron pins are supplied for mounting the suspension springs. The cross section of the spars can be of the following types: 1) Round or rectangular solid cross section. 2) Closed thin-walled hollow round or rectangular box section. 3) Open thin-walled rectangular section such as C, I, etc. The channel section (both C and I) have higher bending stiffness than solid square bar with equal cross-sectional area. Considering the bending stiffness of the solid square section as 1, the relative bending stiffness of the other sections is: 1) Solid square bar: 1.02) Solid round bar: 0.953) Hollow circular section: 4.34) C-shaped rectangular section :