Quick update on the 21" wheel street rubber:
The Avon Roadrider Am26 front is superb, far superior than the oe pirelli's in the dry and especially the wet. Steering is slightly heavier , giving a more confidence inspiring feel of grip. The profile does seem slightly lower but I have not encountered any adverse handling or stability effects
Avon have told me the matching rear is due very shortly ( about july 06) so will give a further report when its fitted.
Overall, for my 990 the Avon is the road tyre to fit