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A track system for a track vehicle which has a crawler chain and a driving sprocket wheel. The chain has links each of which has a pin assembly with a bushing or one piece bolt the outer periphery of which at least is composed of a material consisting of Si.sub.3 N.sub.4 silicon nitride or a zirconi

A track system for a track vehicle which has a crawler chain and a driving sprocket wheel. The chain has links each of which has a pin assembly with a bushing or one piece bolt the outer periphery of which at least is composed of a material consisting of Si.sub.3 N.sub.4 silicon nitride or a zirconium oxide with at most 15% of sintering additives. The driving sprocket wheel can have segments formed with the teeth and bolted to a disk, the segments being composed of a material consisting of Si.sub.3 N.sub.4 silicon nitride or zirconium oxide with less than 15% of sintering additives.

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[ What is claimed is:] [1.] A track system for a tracked vehicle, the track system comprising:a crawler chain comprised of:a bolt having opposite ends,a bushing on the bolt between the bolt ends and wholly composed of silicon nitride material with less than 15% of sintering additives and a Weibull m

[ What is claimed is:] [1.] A track system for a tracked vehicle, the track system comprising:a crawler chain comprised of:a bolt having opposite ends,a bushing on the bolt between the bolt ends and wholly composed of silicon nitride material with less than 15% of sintering additives and a Weibull modulus in excess of 20 or of zirconium oxide,a pair of inner links spaced apart by the region and having bores receiving the bushing adjacent the bolt ends, anda pair of outer links flanking the pair of inner links and having bores receiving the bolt ends, the links of one of the pairs pivoting relative to the links of the other pair about the bolt; anda driving sprocket wheel engaging the chain for driving same, the sprocket wheel having teeth engaging the bushing and formed of a material different from that of the bushing.