I only increase my tire PSI when I fully load up the bike with travel gear. We both weigh in less than 150lbs with all of our riding gear on so 150 to 300 I haven't seen any need for additional PSI.
Now when I threw in an additional 115lbs of gear (44 lbs haning off my hitch rack which is quite a bit aft of the rear axle) not only did I increase my rear PSI by 2 lbs (from 32 to 34), I also had to drop the preload on my front forks to 5.5 turns (down from 10) to flatten out the front/rear sag and stabilize the front at speeds over 90mph.
At 34psi I saw a max pressure increase to 44psi (30%) while running at interstate speeds. Unfortunately, I didn't make a run at 32psi to see what change the additional 2psi made in pressure gain so I'm not sure what advantage (if any) was gained by bumping up the pressure.
Running 1 or 2 up without any additional gear at 32psi, I normally only see about a 6-8lbs increase (20-25%) when running at interstate speeds in temps around 80F. So I was running at a bit higher pressure increase percentage than usual even with a 2lbs increase and fully loaded for travel.
This is my first big ride two up since converting to the DS. I have a Kumo RF and I am interested in the tire pressure to run two up.
Anyone or everyone know this?
Thanks for all.
Ray