The Nimbus II frame is for Freestyle, Hockey and Street. The extra long seat pipe brings stability; therefore your short seat post can not be bent as easily. The Clamp, now being placed closely to the seat, helps the stop those scratches and will not cause anymore bruises when doing Stand-Up tricks.

•  20 inch
•  Chrome-plated
•  Bearing distance: 100 mm (middle to middle)
•  Required seat post: 25.4 mm

You should at least have this inseam length to be able to ride the frame.

300 mm: 74 cm
400 mm: 84 cm

Under the assumption, you are using 114 mm Cranks and a flat Freestyle saddle. By use of other components, the values should be changed accordingly.

In this frame, you can also use the standard 20 x 2.5 inch tire which is used in Street!