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Shimano 105 Di2 FC-R7100 crankset. The newly designed cranks offer the perfect balance of light weight and efficiency. The crank, made of hollow forged aluminum, is anodized with a sleek gloss black finish that gives it a high-end look. Resin ribs on the back of the chainrings characterize SHIMANO 105’s unique structural design that offers low weight with precise shifting performance.