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The main reason to choose a recumbent bike over an upright bike is for safety and/or comfort. In cases where balance is an issue or if the rider is dealing with back, hip and knee pain, a recumbent bike may be a better option.he main reason to choose a recumbent bike over an upright bike is for safety and/or comfort. In cases where balance is an issue or if the rider is dealing with back, hip and knee pain, a recumbent bike may be a better option.
1 action = reaction. 2  If the bike is upright, it will stay upright unless there are sideway forces. 3  This is true even when the bike is not moving. 4  if there's some force that disrupt the balance, there needs to be an equal amount of counteracting force to maintain balance.t should be as simple as this: 1  action = reaction. 2  If the bike is upright, it will stay upright unless there are sideway forces. 3  This is true even when the bike is not moving.