Tire pressure was right about 60psi. I dropped it to 50 then 45 and 40. I could tell a difference with every step. Though, the specs on the tire say 56-85psi is their range so I am well below. Continental Contact II's. I weigh 146lbs so I am not putting a huge load on the bike/tires, but I also don't want to bottom out the rims... Loading up with gear would change the parameters too, when I get that far.