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Is there any huge differences in tire pressure? I'm running 700x25 Conti GP 5K around 120PSI, well with in spec of the tire and rims. I checked out the silca pressure calculator and it saying my optimal pressure should be around 90PSI (average between a few different settings). Would I get more out of running 90 over 120 aside from a bit of comfort? The roads I typically ride on aren't crazy bad and I avoid potholes.