Materials / Manufacturing

The vast majority of BMX stems are made from strong, lightweight aluminium alloy, with 6061 and 7075 being the two most common types. 7075 is regarded as having a higher strength to weight ratio. Most higher-end BMX stems will feature extensive CNC machining to shed weight without compromising strength. The machining process maximizes strength as it is cut from one block of material so no joins will be needed.  This process is very common for most stems that range in the $90-$150 range. 

Cold forged BMX stems undergo a different process where a bar stock is inserted into a die and squeezed with a second closed die. The deformation starts at room temperature and changes the shape and size of the initial part until it has assumed the shape of the die. Forged stems can start as low as $39.99 and will stand the test of time.