Enduro-MAX Cartridge Bearing. Features: High performance cartridge bearing with 35% greater load capacity than a standard retainer separated cartridge bearing Designed specifically for suspension pivots. Generally do not spin as smoothly as retainer bearings due to their maximum complement of ball bearings (MAX) 90% filled with the highest quality grease 3rd party web sales (eBay, Amazon, etc.) are strictly prohibited by the manufacturer Specs: Bearing:3801 ID X OD X W Mm:12x21x8