Big Ceramic Hybrid bearings to fit Trek's own BB90 (road) & BB95 (mountain) internal bottom brackets with Shimano HT2 cranks.
Shields are included to protect the bearings from direct contaminant entry.
Ceramic hybrid bearings have a conventional steel outer race but with ceramic balls inside. The harder ceramic balls roll a little easier, weigh a little less and the bearings have been designed to minimise rolling friction. These are ideal bearings for those seeking higher performance and lighter weight.