not collinear a contact surface 52 of the distal portion 46 is also angled downward parallel to center axis c 2 when the sensor 40 is installed through the aperture 42 of fig1 and secured to steering knuckle 20 the midportion 50 must flex to overcome interference between the cap 34 and the distal portion 46 as illustrated with respect to the wheel assembly 10 a of fig1 the aperture 42 is designed to be adequately sized to allow the midportion 50 of the sensor 40 shown in fig2 to flex over the full expected range and the distal portion 46 to be deflected over a full expected range when flexed and fully installed the contact surface 52 is configured to be in full contact with the outer surface 47 see fig1 of the cap 34 because the midportion 50 is narrowed flexing occurs in and stress is concentrated in the midportion 50 rather than in the distal portion 46 the midportion 50 is designed so that strain and stress due to flexing will not exceed predetermined amounts based on a range of expected interferences between the distal portion 46 and the bearing cap 34 due to stack up of dimensional tolerances of the wheel hub 12 outer race 18 bearing cap 34 steering knuckle 20 and sensor 40 furthermore the material of.