This is the upgrade I did on my Ritmo 100S. Although this upgrade would also be possible on other Ritmos and Uno Turbos.
To complete this conversion on a Ritmo 100S, you need the following:



Discs from Tipo 2,0 8V or Punto GT (257*20 mm)


Caliper brackets from Tipo 2,0 8V or Punto GT


Brake pads


Calipers. Here you can choose either a Uno Turbo caliper with 48mm piston, or a Punto GT caliper with 54mm piston. I used
          calipers from a Croma Turbo, which are similar to the Punto GT.


Adapter plates 6,5 mm thick


If using 54mm calipers on a Ritmo, you will need to change the master cylinder/brake booster to an 22mm Abarth item.
If performing this upgrade on an Uno Tubo I will advise you to keep with the 48mm calipers.

The adapter plates will need to be made up. I made mine in a lathe.