The Road-ish Riv Rubber Radius thread got me thinking about PSI adjustments while on longer rides. Last month I rode my 56cm 650b Atlantis from San Francisco to Olema via Mt. Tam and the Bolinas Ridge Fire Trail (which was about 13 miles and our main gravel section of the day) and back to SF via Samuel P. Taylor and Fairfax. A glorious 75 mile-ride (80% road/20%gravel) with 6000 ft of climbing on a perfectly sunny, temperate day. We stopped at Pantoll Station midway to the top of Mt. Tam and made coffee and had some decadent pastries and smoked salmon. Everything was perfect.....except for one five mile stretch at the end of the Bolinas Ridge Fire Trail. A "relentless descent" characterized by obstinate cows, hard-packed dirt that could only be described as rutted washboard, and lots of time spent death-gripping my TRP brake levers on my newly mounted 666mm Crust Towel Rack bars. Once past this stretch, the ride returned to its' earlier glory and we headed home through idyllic Marin County. A great day of mixed-terrain riding. In retrospect, though, I can't help but think that I could have avoided the unpleasantness of that 5-mile descent had I just thought to lower my PSI before getting on the fire trail. Being that the first half of the ride and the final 35% of the ride would be on the road, I started (and finished) my day out at 42 PSI on my 48mm Rene Herse Switchback Hill Endurance tires. Now I'm kicking myself for not lowering the pressure significantly. And I figured that this would be a good place to ask for others' experience with mid-ride PSI changes. Is this something that folks do regularly or are y'all more inclined to choose a PSI that will work on mixed terrain? And if frequent PSI changes are the norm, what pumps are your favorites? Since most (?) Riv-Riders seem to be almost obsessed with bags as they are with their bikes (I rode with my Fabios Chest L on this particular day) I figure that pump size is not as important as pump efficiency. Thanks for your consideration. Alex
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