PLEASE NOTE....it is your responsibility to select the correct parts or material for your intended use, to work along with your design, such as for framework, a Cold Drawn Seamless ( CDS ) in a 4.06mm wall thickness, would be a stronger option for the Top Spine to the Steering Headstock connection ( together with other suitable bracing tubes/gussets ) than a BUDGET..... Electric Resistance Welded ( ERW ) 3.2mm wall tube ( for when braking forces are applied ) or for any other highly stressed areas, so if in any doubt.... always ask for advice.