NSK 6803 Ball Bearing w/ Dual Rubber Seals - Bicycle hub
This is a 17x26x5mm deep groove ball bearing with full contact rubber seals on both sides of the bearing. This type of bearing is commonly found in bicycle hubs. B earings have many different names for the same product depending on the manufacturer. These are equivalent to, 61803, 6803.2RS, 6803.2RS1, 61803.2RS, 61803.2RS1, 6803DDU, 6803LLU.