Product Description The Enduro Bearings DR 17289 Ball Bearing is a double-row MAX bearing This deep groove ball bearing from Enduro Bearings has an inner diameter of 17 mm, an outer diameter of 28 mm and a width of 9 mm. This is a double-row MAX bearing, which is characterised by a 35 to 40 % higher load capacity compared to standard radial bearings. For over 20 years, Enduro Bearings has been manufacturing MAX bearings specifically for use on mountain bike shocks. As the name indicates, they are fitted with the maximum possible number of balls. The grooves in the races are deeper to accommodate the multiple lateral turning forces at the MTB rear pivot. Specifications:Dimensions (Inner x Outer x Width):17 mm x 28 mm x 9 mmDesignation:DR 17289Models:Type 1: Design:deep groove ball bearingsTolerance:ABEC 3 / ABEC 1Recommended Use:Suspension pivots, shocksInner Race Material:steel (52100)Outer Race Material:steel (52100)Ball Material:steelSeals:LLUManufacturer Number:DR17289LLUMAXBOFeatures:bearing balls in double row (DR)MAX = maximum number of balls, without cage or partitionsLevel 1 rating from the Annular Bearing Engineer's Committee (ABEC) in terms of noise, manufacturing tolerances correspond to level 3chrome steel balls 10th degree = circularity is 10/1,000,000"race grooves made of carbon-chrome steel alloy, heat and cold treated (down to -190° C), minimum hardness Rockwell HRC 62, polishedLLU: seal type with double lip in a groove in the inner tread; particularly dirt/dust resistant due to higher pressureblack oxide (BO) for higher corrosion resistance and hardnessContents:1 x Enduro Bearings DR 17289 ball bearing, 17 x 28 x 9 mm Manufacturer: Enduro Bearings 650 Lighthouse Ave. #120 Pacific Grove CA 93950 USA info@endurobearings.com Distributor: Cosmic Sports GmbH Leyher Straße 47 90763 Fürth Germany info@cosmicsports.de