4JT Yamaha TZ125 front disc Brembo 280 mm cast iron rotor

4JT Yamaha TZ125 front disc Brembo 280 mm cast iron rotor. This is a Yamaha kit option disc, in cast iron. Cast offers better initial grip whilst braking and is better in the wet. However, as they rust, they do make a bit more dust than stainless discs, hence are a lot rarer. Not everyone wants to clean their wheels more often for the 5% braking advantage.... you could say, maybe some like to win more than others! I've run a wire brush over a small section to show it's just surface rust.