ABI MR18307 Sealed Cartridge Bearing 90% filled with Mobilux NGLI 2 synthetic grease, dual-lip labyrinth seals If the bearing you are replacing is not marked with a manufacturer number, measure it and compare to For some DT, Bontrager and Giant applications Replaces 6903 bearings with 18mm bore in DT Swiss hubsItem SpecificationsBearing I.D.18Bearing 90% filled with Mobilux NGLI 2 synthetic grease, dual-lip labyrinth seals