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SKF developed a solution for the highly stressed bearings with the use of rollers instead of balls on the chain side. Rollers can carry a much higher load than balls of similar size. The SKF bottom bracket is made of a one-piece shell that allows the unit to be perfectly sealed and it will ensure the bearings to run perfectly linear even in BB-shells that are not perfectly straight. For the sealing of the unit we adapted a solution that was developed for automotive applications: The patented SKF axial seal provides low friction under normal circumstances but its lids close tight under pressure.While the main focus for OEM business lies in the ISIS-drive BBs for mountain and road bikes and the aftermarket with square ISO and JIS spindles.