20 also includes an axial portion 28 which is adjacent to the outer race 4 the first support member 10 and second support member 20 are preferably made of stainless steel for corrosion resistance but alternatively they may be made of a polymeric material with magnetizable material the polymeric material may be a thermoplastic or thermoset plastic or the support member 20 may also be made of a ferrous material such as steel which is treated for corrosion resistance the multipole ring member 40 is preferably made of a magnetizable material in an elastomeric material such as nitrile nbr hydrogenated nitrile hnbr polyacrylate acm ethylene acrylate fluorocarbon fkm a thermoplastic elastomer tpe a fluoropolymer a thermoplastic vulcanizate tpv or any other similar material suitable for the application the magnetizable material is a ferrite powder or ferrite filaments the magnetizable elastomeric material has north and south poles alternating in the circumferential direction and extending in the radial direction which as the wheel rotates move alternatively past the rotating sensing device 30 the rotation device 30 may be a hall effect device or a magneto resistance device the seal member 50 is molded to the radial portion 24 of the second support member 20 so that the seal body 52 covers the projecting portion end of the rotating sensing device 30 facing the multipole ring member 40 the seal member 50 has a radial lip primary seal 55 extending generally in the radial direction from the seal body 52 the radial lip primary seal 55 includes a first radially extending sealing member 54 which has a garter spring 58 located in an annular groove 57 on the first radially extending seal member 54 the first radially extending seal member 54 is in fluid tight.