I'm 110pounds and my LBS recommended 110 PSI. I tried 90 PSI vs. 110 PSI but the ride felt the same to me on my road bike. So, I stuck to 110 PSI to decrease the chance of pinch flats.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle