Interesting stufff...I have a 6inch Marchi on my 916, so ideally I need a 190/55 to do the business, but most makes (pirelli diablo etc) only do a 190/50.
However, they say that Dunlop 208's are now available in 190/55's and that clearance may be an issue with the swingarm...but I remeber from the JHP visit that I saw a 999 with a 190/60 209GP fitted...whats that all about!!!?????