The zero ii pas tirox is a flat saddle for short to medium distance riding where a frequent change in position is necessary this saddle features new tirox rails these are made from stainless steel for a lower weight than the old ti 14 rails greater resistance and vibration absorption the pas system is a processing of the base of the saddle the hole or channel has been designed to eliminate pressure to a zone of support delicate as the pelvic area prevents pressure peaks in the prostate ar