I weigh anywhere between 130 and 140. My preference is a 25 in the back and 23 in the front, I have done this with many kinds of tires. although there is great debate on this subject, I believe it is beneficial setup. I keep the back at about 95~ and the front at 90~. If I know I will be riding on very smooth roads I will pump them up 10-20 more psi. But generally I dont break 100. Any higher and the pain starts kicking in.