Joined: Feb 2013
Posts: 1,472
Likes: 11
From: Near St. Louis, Missouri
Bikes: Giant Defy Advanced, Breezer Doppler Team, Schwinn Twinn Tandem, Windsor Tourist, 1954 JC Higgens
I weigh about the same as the OP. Around where I live we have a lot of chip and tar. Therefore I switched from 23s to 25s and dropped pressure from 120 to 100 psi.
My best results in both a double-century and 24 hour ride came on the 25s. I didn't get beat up as much.