Profile Galaxy Winter Cloud Sprocket 22mm Spline Drive The Winter Cloud is the third colourway in the Profile's seasonal series "Sibling Unity" celebrating Shane Halahan. The Profile Galaxy sprocket is made from 7075 aluminium in Florida, USA and has a hardened chromoly steel insert for use with a 22mm diameter, 48 splined crank spindle. What is a BMX spline drive sprocket? Typically a BMX sprocket attaches to the BMX crank arm by a single bolt, this means that all the force from the cranks turning goes through this bolt. Whereas a spline drive setup means that the centre of the sprocket is in full contact with the sprocket. This creates a more direct transfer of power when riding and many riders don't go back to traditional sprocket bolt once they've tried a spline drive setup. Profile Galaxy sprocket Black specifications: Brand: Profile Racing Material: CNC machined from 7075 aluminium Weight: Colour: Winter Cloud anodized Chain: Compatible with standard 1/8 ” chain widths Adapter: Includes 22mm spline drive adapter (already fitted) Additional information: This sprocket can only be used with a 22mm diameter, 48 splined crank spindle. Profile spline drive sprockets are not compatible with right hand drive 2-piece cranks as there isn't enough room to put the sprocket on. However they are compatible with left hand drive 2-piece cranks.