Enduro ABEC-5 Angular Contact Cartridge Bearing. Features: Super smooth, fast design with very low resistance 15 degree angular contact design is ideal for hub and bottom bracket applications where bearings are likely to experience side loads Single row cartridge bearing with self lubricating, nylon cage separated ABEC-5 balls Install with red seal facing out, 5-10lbs preload required 3rd party web sales (eBay, Amazon, etc.) are strictly prohibited by the manufacturer Specs: Bearing:71806 ID X OD X W Mm:30x42x7