From what I've read on Blatchat, 20 psi and lower is "normal" for a Seven. I usually run around 18 - 20 psi (with the infamous Michelin Pilots aka "pileups").
Steve
Sal - You might want to take a look at this link
>http://www.blatchat.com/T.asp?id=85125
or this one
>http://www.blatchat.com/T.asp?id=70854
I did a search on "frame number" on Blatchat to find the posts.
Hope this helps.
Steve
'98 Caterham 1700 Crossflow