my current bike is a hardtail GF Paragon. it's the only 29er that i have ridden on trails. i am approx 225 pounds and i've been setting the air pressure to about 31psi front / 33psi rear. i notice that the Bontrager 29-3 2.25 tires shape does not change near as much as the tires on my last FS 26" bike. On the 26" bike, the WTB Velocoraptor tires contact patch would "flatten" noticably when i mounted up and rode. and the bike's handling on pavement was squirrely when running lower pressures. the 29er doesn't have either of those traits. i cannot notice any flattening, and it moves along and handles just fine on pavement with the 31/33psi. i have only been on a few rides with the new bike. but the tires have not ever hinted at bottoming out to the rim or washing out. so i realize i can drop the psi down more. but i am wondering why there is the difference between the 26" and 29" tires at approx same psi? is it due to size of tires, tire compound, or what? or maybe this is all in my head? all of these are tubed tires. thanks in advance for any insights.