Roll-Line Speed Max Bearings have a single metal shield to help keep the dust and dirt out, remaining open on one side to allow optimal cleaning. The high performance ball crown cage is carbon impregnated to provide a little extra dry lubrication to ensure these bearings will perform far beyond most others.
These ultra high performance bearings will perform at the level of some of the most expensive ceramic bearings, but have the resiliency and strength of bearings with 8 steel balls to provide better performance for much less cost.
The Roll-Line Speed Max Professional Bearings are wonderfully free rolling with absolute minimal radial play which promotes and very evenly distributes the load across the 8 balls for optimal roll and a good amount of axial play or thrust (which is the side movement of the inner race in relation to the outer race). This movement is very important because when skaters push, we always put side load on the skate to get power in the push or stroke. If the bearing does not allow for this, it will bind and lose operating speed or roll. These provisions in the race curvature and contact angle allow the Roll-Line Speed Max Bearings to roll very freely.
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