since your riding a mountian bike over longer distances I would suggest replacing the knobbies w/ some slicks if you havent already. less rolling resistance, quieter, smoother ride, maybe even a higher pressure threshold depending on the width....
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks