Originally Posted by
Gallo
your weight and the tire are big factors. Too little air and the tire loses form and can roll of the rim or they can burp. You need air in the tire to keep form. It is a dance and an experiment but there is no one right pressure you can get from a book. You need to find out what is best for your tires by riding and adjusting. Your weight,the bike weight rims and tires will be big factors for proper pressure. Use the book and internet to find the range and adjust to your liking
25 psi is low for a tube and you risk pinch flats
It is not how low can you go it is about getting the best performance
good luck
I've had pretty good luck so far with 25 psi. So far no issues ever. My weight is 165 lbs, and the bike is 31 lbs. Found this calculator:
http://mtb.ubiqyou.com
which recommends 34 psi front, and 37 rear. I like the 25 psi, but maybe should switch to tubeless for more security?
Dave