Endless loops (3) spaced lenghtwise of elongated grouser-mounting base plates (15, 15') of a tractor endless tread in which each loop (3) includes two side-by-side stretches of wire rope (11) having the interstices (13) between the strands of both wire rope stretches filled with elastomer material, and both stretches of wire rope (11) being embedded in elastomer material (12) integrating the two stretches into a single embedment, the two wire rope loops (3) being secured to the grouser-mounting base plates by spaced U-shaped bends of clamping strips (16, 16') bolted to the grouser-mounting base plates (15, 15'), and spacer plates (36, 36') bridge between adjacent grouser-mounting base plates (15, 15') and make loose tongue-and-groove joints therewith for enabling the grouser-mounting base plates (15, 15') and the spacer plates (36, 36') to tilt relatively as the endless tread travels around a tractor wheel, but the straight tread portion of the tread extending between tractor wheels spaced lengthwise of the tractor is substantially inflexible inward.