Price history on Walmart.com for
Enduro ABEC3 Sealed Cartridge Bearing 21531 21.5x31x7mm Steel
See on WalmartProduct info
ABI Standard Design Cartridge Bearings. Features-If the bearing you are replacing is not marked with a manufacturer number measure it and compare to specifications listed-90% filled with Mobilux NGLI 2 synthetic grease dual-lip labyrinth seals Item Specifications-Material:Steel-Bearing I.D.:21.5-Bearing O.D.:31-Manufacturer Number:21531-Thickness:7
... read more.