Big 4-inch gauge reads 1psi increments from 5-35 PSI for high-volume low-pressure tires (Gravel, MTB, and Fat bike applications). 5psi increments from 35-140 PSI. The 140PSI max pressure should be plenty for most rode bike tires. Pump head has a built-in pressure release button to fine tune your air pressure without removing the pump head. 4" Dual Scale Gauge Displays 1psi Increments up to 35psi & 5psi increments from 35-140psi Pressure Relief Button in Head Ergonomic Handle Simple Valve Smart Head Fits Both Presta Schrader Valves Durable Metal Barrel and Base Limited Lifetime Warranty* Weight: 1500gm Capacity: 140 PSI Height: 28 1/2"