Shimano manufactures bicycle clothing and components including brakes, pedals, cycling shoes and gloves. One Shimano item available for sale individually or as a component on certain brands of bikes is the FC-R553 crankset.
A crankset is made up of the chainrings, crankarms and bottom bracket of a bike. The chainrings are the front gears. Crankarms are the two "bars" that your pedals attach to. The bottom bracket is the piece that fits into your bike frame to hold the crankset onto the bike.
The Shimano FC-R553 crankset is available in either a black or silver finish. The gearing (the number of teeth on the chain rings from large to small) is 50-39-30. The crankarms are available in 165, 170, 172.5 or 175mm lengths.
The variety of lengths of the crankarms mean the FC-R553 will fit people of many heights (the taller you are, the longer crankarms you will need). The gearing makes this crankset optimal for a road bike or a hybrid.
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