ONE STEP / Convenient bicycle

This bike is different another common, can support itself when you take off.
User sit the saddle and press the spring with user weight.
Then the stand bar rises up automatically.
And when get off the bike, the stand bar descends.
The pedal and the saddle are connect.
When you press the pedal or the saddle, the stand bar rises up.
So can ride the bicycle sitting or standing.