Originally Posted by mgearing

I have a Trek Pilot 5.2. I weigh 180. After using 25mm tires, I experimented with 23mm running at 110 to 115. The ride quality definitely deteriorated. I found much more road buzz coming through. I finally gave up on the 23mm tires, and put 25mm tires back on, at 95 to 100. In both cases the tires were Conti GP4000s. The only differnece was the size and pressure. The bike feels much more comfortable again.