Yeah, thats the thing, lots of people go by the manual or sticker on the bike... thing is, you change your rubber and that has pretty much no relevance. Also need to take in rider/pillion weight.
On the track I dropped about 10% front and back...
Sticker/manual should be taken into consideration, but in general you need to go by tyre rating and feel. I bike bought in 1980 with 2011 tyres is not going to want to rely on sticker/manual.
Road conditions and rider style play a factor as well. I was running 12/15 psi front and back the other weekend
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