I think his Type S are forged aluminium wheels. Mag versions don't come in Ninjette sizes, last I checked anyway.
My last race-bike came in at 323-lbs with 4-ltr petrol. Due to AFM's Superstock rules, I was limited in what I could do. No engine-mods allowed, no frame or harness mods. After 2nd season, I was planning on going to Superbike, which allowed any mods as long as frame & engine matched. Chopped off another 11-lb or so, but didn't get chance to weigh before selling it.