Using your Topeak Roadie TT Mini Twin Turbo pump is easy. First, make sure the pump head is clean by using the integrated dust cap. Attach the Presta head to your bike tire valve and use the aluminum thumb lock lever to secure it for an air - tight seal. Then, start pumping. The TT TwinTurbo technology will help you fill the tire faster with less effort. Remember, the pump has a capacity of 160 psi / 11 bar, so don't over - inflate your tires. When you're done, remove the pump head gently. For maintenance, keep the pump clean and dry. You can wipe it with a soft cloth. Check the thumb lock lever and dust cap regularly to ensure they're in good condition. If you're not using the side - mount bracket, store it in a safe place to avoid losing it.