i run 42psi
I would be reluctant to go past 28psi - Normally what you will find is the ride is almost as harsh as a cement radial plus the life of the tire will be 10k or less. 26psi seems about right and will last for no less than 30k.
I run CT's on all my bikes including the ST and find less is better - running 15psi on the new STealth which seems almost a bit to much. Recommended is 13-17psi by Can Am and I found 12psi to sit about right.
I have seen many posting regarding CT's and less than favorable life expectancies and they all center around 40+ air pressures. I think most Radial CT manufactures recommend 32psi for a car which weighs much more than a Valk so one would think less would be more inline. I think one misconception is that higher pressure will make the tire more convex and therefore cornering will be more MC tire like however a CT reacts differently in a corner than a motorcycle tire. The flexing of the sidewalls in a corner replaces the rolling action one experiences with a convex MC tire design. The more air one adds to a car tire the more it tend to "lift" on the edge making cornering less precise and requires a bit of effort opposed to a ct with lower pressure or a convex type mc tire. Also the higher pressures cause greater center wear and therefore poor tire life.
I guess if I were to run 40 psi I would just stick with mc tires as all the advantages are lost under these conditions. Over the years on the Wing board most riders who run higher than 30psi have fallen into the 9k or less life cycle which is no better than the Junk tires.
As far as the front - even though I am a diehard CT user I don't think I would even attempt ct's on the front except for the Can Am or STealth as the cornering dynamics are all wrong for this type of application. One can get by just fine on the rear but the real corning control and lateral force is focused on the front or destabilizing end of the machine.
I would be scared
