Designed for low pressure high volume tires the air tool mtb floor pump provides precise pressure to ensure that your tires are set up for whatever the trail throws at you large 3 76mm oversized gauge massive 508cc volume aluminum barrel pushes enough air to seat tubeless tires ergonomic wing handle with pressure relief valve auto selecting switchhitter ii technology includes spare rubber seal for head max pressure 75 psi 52bar volume per stroke 508cc