High performance lightweight and stiff 2014 forged alloy oversized stem 2014 forged aluminium is a high strength aluminium alloy commonly used in the aircraft industry and a wide variety of high strength engineering applications making it the ideal choice to produce this lightweight strong and reliable stem oversized 318 mm clamp diameter reduces unwanted flex under high load by increasing strength and stiffness reversible design with 10 degree rise for 1 18 inch diameter steere