Roll-Line Speed Race 8mm Bearings are in treated steel resulting in low friction, this offers an excellent smoothness. Shielded on both sides to always have an excellent performance over time. The inner and outer ring are made of steel with lapped tracks, with the inner ring separating the self-lubricating spheres.
The Roll-Line Speed Race Professional Bearings are free rolling with minimal radial play which promotes and very evenly distributes the load across the 7 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 Race Bearings to roll very freely.
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