A snowmobile frame (106) is described, with a tunnel (108) having an inverted U-shape. An engine cradle (110) is attached to a forward portion of the tunnel. A suspension assembly (112) is disposed forwardly of the engine cradle. At least one support member (142) supports the suspension assembly on the engine cradle. The at least one support member forms a crumple zone between the suspension assembly and the engine cradle. The at least one support member resists plastic deformation in response to the first predetermined force exerted on the suspension assembly. The at least one support member undergoes plastic deformation in response to a second predetermined force being exerted on the suspension assembly. The second predetermined force is greater in magnitude than the first predetermined force. The tunnel resists plastic deformation in response to the second predetermined force.