25 psi is really too low. don't mention what size tires they are 15", 16", or 17". 15 or 16 would be fine anywhere 32-38 psi, possibly 40 psi even though it may be a little hard on the ride. it is correct to assume roughly 4 psi extra on hot tires. too low air, results are too hot, too prone to bulging and possibly blow-outs on potholes/rough roads, and insufficient support from tires and might damage wheels. too high, and u might blow-out prematurely just from too much pressure. one way to check if u've got the correct is to look at the wear on your tires. if it's wearing out in the middle, it's too high. the tires should give a little where the tire meets the road, but not too much or else it's too low; u would probably see some funky wear on the sides of the tire instead of normal wear out the treads. too low, u will also have very weird handling, as the tires squirm a lot more. 44 psi is usually the max on many tires. i've got 17" and i used to run on 32...had too many blowouts (although all reimbursed by cities)...so i run 39 psi now. yeah, u do notice the ride is harder, but at least there's more air to take up the hard hits from potholes and save urself the hassle of repair/replace and asking cities to reimburse. hope that helps. just make sure it's not over the TIRE manufacturer's max pressure, even when it's hot, which can be located on the side of the tires.