The term 'PART OF A BIKE' can be broken down into two crossword solutions: PEDAL (5 letters) and SEAT (4 letters). The PEDAL is the part of a bike that the rider pushes with their feet to propel the bike forward. It is connected to the crank, which is connected to the chain, which in turn is connected to the rear wheel. The SEAT is the part of the bike where the rider sits while riding. It is usually padded for comfort and is adjustable to fit the rider's height.