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OMB Warehouse stocks a large collection of mini bike 1 3/8 in bearings that are of the highest quality and sourced from leading brands and top manufacturers. Our thick precision sealed mini bike 1 3/8 in bearings with Snap Ring, and Two seals are precision ground and made of hardened components for high speeds and heavy-duty applications. Universal fit for most Vintage mini bikes and other makes and models of mini bike. Our selection of bearings includes spindle bearings, bearing cassettes, wheel bearings, needle bearings, hub bearings, and even axle bearings. Sizes include 10mm, 15mm, 17mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, 5/8 in, 1 3/8 in, 7/16 in, 1", 1-1/4", 1/2", 3/4", 7/8", and others. There is also the mini bike wheel; bearing with 5/8 in internal diameter and 1 3/8 in outer diameter. The bearings have a 5/8 in bore`, sealed and have a hardened and ground raceway. These are top quality bearings and are perfect for high speeds and regular to heavy duty applications. Though bearings are sold individually, the usual requirement is two bearings per wheel. Go through our catalog and get what you need in mini bike bearings in 5/8 in inner diameter, 1 3/8 in outer diameter and 7/16 in thickness.