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Bicycle is more widespread use in whole world.Lots of people who live in city usually ride bike for commuting.However,to those who live in apartment,it’s really hard to move bike into elevator.
Therefore I decide to design a bike rack with wheels.It usually is a propstand.When you are going out,just rotate your bike a quarter turn and then you can easily move your bike into elevator.After you get out of the elevator,turn it a quarter again,it could become a carrier rack to carry something.
It’s convenient for people to ride bike everyday.