my 04 r6 has 120/70 front tyre but in manual 120/60 is recommended as im new to bikes could any one tell me why this would be done and pro and cons cheers

Just posted something up about this in the Sportsbike forum (see below)

Standard size should be 120/60 17 on the front. A few months ago I changed to 120/70 17 on my 04 r6 (went from Pirelli Diablo's to Pirelli Diablio Rosso's - only increased size because they don't or didn't do 120/60 17 at the time.

Personally I didn't rate that size (120/70), where I usually get the front tyre wearing reasonablly round I had a flat spot on each side of the tyre at about 45% .. never seen anything like it before.

I understand the logic of the larger profile, it should give you more tyre contact when lent over, I've tried it and gone back to the 60 profile which I feel gives me more feedback.