Front derailleur

At last I got bottom bracket for sports bike.
then I could attach front derailleur.

 Bigger chain wheels has 52T. Smaller one has 39T. The one with 42T touches the frame, so it was changed to 39T's.

 I changed the chain new one. I bought 2nd hand chain wheels. I had to bend then to adjust.

 The spring of the front derailleur is too hard.

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.