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Green Bike USA GB500 にも：マニュアル (19 ページ)

6. Insert the seat into the seat bar, make sure it's inserted to at least the minimum length (H),

which is marked on the seat bar. Make sure that the seat is tight and at the right height for you.

7. Open the lock (J) to adjust the angel of the handle bar, so you can comfortably use the brakes

and look at the display.