Attaching a part of the seat

This is a mat for bath.

Just cutting to fit to the measurements between 2 parts made from board.
Then maked holes to tie up.

Just it is tied up with nylon strap.

View from back side. The flexibility of the mat for bath looks better.

When I sit, it fits to my back better. it works to support my shorter legs.

The mat for bath is cheap, but good material for a part of seat, I think.

By attaching the mat, the seat can not be fold.
That's not bad. I will ride more comfortable.

Before that, I got max speed 44 km/h.

Since getting it, I have not gotten more speed.