We run twins in the Manx with newcomers and the TT. 2 riders at the TT used both Metzeler and Dunlop. Metz/pirelli were SC1 front and 160 SC2 rear. The rears lasted up to 6 laps in practise but we had new ones on for the 3 lap race. Dunlops last miles longer with a "strong" Ntec 180 rear at the manx you should easily get 8 laps in with a decent suspesion set up. We will be there in the newcomers and supertwins race on Dunlops so if your struggling for info just ask.