Believe it or not I found that being in the forward crouched position shares the weight between my butt and arms which is actually more comfortable in the long run. On a Mtb or something more upright all my weight is on the saddle which makes my lower back and butt hurt more.
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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