DSC Club Member
Big Twin
Posts: 1,600
Join Date: Oct 2004
Location: Sevenoaks
Mood: Im Going to Italy soon!
The H rating requirement is a stipulation from Pirelli regarding the safety of the tyres.
Desmo Due bikes do not have enough power and are too light to get the Z rated tyres up to proper operating temperature on the track, they are in the right envelope to work the H rated tyres properly.