Schwalbe procore tube setoff roadriding at lower pressure means better performance but at the same time it increases the risk of failures the limit so far is at about 20 psi below which its hardly possible to dare to ride normal mtb tires but nothing stays the samein the future air pressure can be controlled in the tires double chambers in the outer chamber the air pressure is extremely low ideal for maximum off road performance in the inner chamber directly on the rim there i