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connecting rod one-piece connecting rods side view 3-d view connecting rod big end bearing roller bearing crankpin caged roller bearing large steel crankpin one piece connecting rods are lighter than split types but require the use of built-up type crankshafts as opposed to split-type connecting rods which use bolt-up type or one-piece crankshafts one piece connecting rods are mostly used in small single cylinder engines like those found in dirtbikes lightening holes keyway crank pin crankshaft pressed together build up crank crank web crankshaft splines built-up and bolt-up type crankshafts are discussed further in a separate article