you guys and duranos! If you have rough roads and durano's with their MINIMUM pressure of 85PSI, that's bound to make any rough ride really exhausting on the rider. What anyone should be doing is throwing on big apples or a much wider tire and tweak the optimal air pressure for your weight class if you have bad roads. I kept mine on 35-40psi (i'm 160lbs) and the ride is enjoyable without sacrificing rolling resistance, took me awhile to tweak and after i got that feeling i did not mess with it anymore. I have a kojak on the front and going over manhole covers I notice a huge difference on vibration on the front and back. Oh yeah that 35-40psi only worked on the big apples for me, on some kenda's that i had on another bike it did not have the same ride qualities at that pressure.

What Is The Optimal Tire Pressure? | CyclingTips

This paragraph from the link is very interesting for you guys to read but ignore the 115-140psi, that all depends on the width of the tire for the optimal pressure:

There’s a perception that running tires at high pressures of 115-140 psi somehow makes the bike roll faster. The thinking behind this is that it reduces rolling resistance because less surface area of the tread is touching the road. However, at higher pressures, internal losses due to flexing of the casing decrease, but suspension losses due to vibration and bouncing of the bike increase. The resulting vertical movement is robbing forward momentum. This cancels out most of the gains the increased pressure attempted to provide. What those high pressures really do is accelerate wear, compromise handling and give an extremely harsh and skittish ride.