A full kit of replacement tapered bearings used in the Surron Light Bee, a direct fit in place of the original bearings.
These bearings take a beating when people are still learning to wheelie, subjecting the bike to frequent and heavy landings - all of that force is multiplied and applied directly to these bearings. After some time, depending on how loose and dry they are, they will start moving around.
Please grease up the bearings when assembling and use proper torque when tightening.
To check your bearings, move your bike back and forward while holding down the front brake and try to feel for movement in the headstock.