1888a123_Beginner_Dirt_Bike___GICL_Wiki_Dirt_Bike_Parts_List_Function
[Part and Quantity] Steering Shaft Assembly (1) [Part Number] DR70-197 [Materials] Metal, most likely steel composite because it is lighter than other steel part, but strength is needed for this part. [Forces] Force would be created as the rider turns the handlebars. Depending on terrain there could be resistance to this motion. Also since this secures the shocks, it would get force from that. [Manufacturing Process] Parts are created then assembled. The two bases are die-cast, because of left over risers. Several parts are then drilled, and threaded. Parts are then assembled by nuts or screwed together. [Shape] Shape is needed for several reasons. First is that the parts are rounded, because die casting straight edges is difficult. Also this is a part that the rider could hit, and straight edges could cause injury. [Part Complexity] 4 [Function] 
Functional: Attaches to the handle bars and the front wheel assembly to allow rider to steer. Also holds the front forks, front shock absorbers.
Group 11 - Beginner Dirt Bike - GICL Wiki