bearing surfaces are provided as indicated at 29a 30a and 32a 33a so that both the portion of the cap above the wing bearing surfaces and the flange portions of the adapter above the recess bearing surfaces have to be worn away before earth passing over the wear cap can engage both sets of bearing surfaces and cause dislodgment of the wear cap well before this occurs the massive section at the front of the wear cap the side wings extending only part way from the rear of the cap to develop this massive section will have been worn away in the fashion indicated at w in fig2 through the earth directing function of the projections 38 39 to provide a visual indication that the cap needs replacement this is true irrespective of the forward contour of the wear cap either that of the embodiments of fig1 5 wherein the cap has a generally box shape in side elevation or the embodiment of fig6 to 9 wherein the central front facing wall 135 is extended below the bottom of the cap to provide a depending flange 137a see particularly fig8 it will also be noted that in the embodiments of fig1 9 the vertical thickness of the wings 32 33 is the same as that of the adapter flanges above the bearing.