Enduro ABEC 5 6903 RS Full Ceramic Silicon Nitride (Si3N4) bearing Sealed

Description

Enduro 6903 RS (17x30x7 mm) full ceramic ABEC 5 bearing with Grade 3 Si3N4 (Silicon Nitride, the best!) balls and races. These have a special design to be completely sealed with a low friction Silicone seal on one side. They are completely sealed in a hub system with 1 seal on each side.  Silicone material is the fastest and most slippery material so these will spin VERY fast and smooth. The retainers are PTFE, again the fastest low friction material available for their purpose. We recommend a threaded bearing press with the correct pilot bushing for installation, not to be hammered or pounded into place.  These will work in a bicycle hubs or some other applications. This sale is for (1) bearing with (1) seal. Please see the photos for proper install instructions including greasing of the bearing before install. After it is pressed into the hub, simply press on the seal snugly.  (Light press, do not over tighten or you can damage the bearing!).