This clever dual gauge floor pump was exclusively designed for low pressure fat bike tires and moderate pressure mtb tires a massive oversized barrel is 15 times larger than a standard floor pump and delivers large air volume to fill oversized tires quickly a 30 psi 2 bar gauge shows precise low pressure for fat bike tires while the 75 psi 5 bar gauge shows higher pressures for mtb tires an air release button on the twinhead allows for fine tuning pressure features dual gauge 0