I must confess i didn't ask whether they were asmetric or rosso pattern, but from reading about the tyres on the pirelli web site, it would seem to me that the Rosso tyre seems geared towards comfort and low noise levels, as opposed to out right grip, but then i might be wrong. From what i can gather about the SO3's, compared to the SO2's, is that the 2's became much harder compound as they wore down, thus less grip....but would imagine that they lasted fairly well on the low tread limit. The 3's on the other hand are a dual compound tyre, similar to a motorbike tyre, so they are consistantly soft, giving consistent grip levels, which i would i guess mean that they will wear out even faster than the 2's..........who knows
I think i am gradually talking myself into the pirellis....the SO3's are a bit too rich for my pocket.....especially for just 3000miles