Smaller, more efficient, reliable-three features of the Specialized Air Tool MTB Mini pump. With the new, inverted double-chamber design, this pump moves more air than the unit it replaced, even more efficiently. Best of all, it's now available with a frame mounting bracket to keep it out of your backpack or pocket and easily accessible on your bike. Features: Inverted, double chamber design is smaller yet increases the air handling capacity by 20% when compared to our previous design, reducing pumping time by up to two minutes. Twist locking head reduces size and can be easily converted to fit Presta or Schrader valves. Machined outer barrel for extra grip while pumping. Aluminum inner and outer chamber for durable performance. Max pressure: 60 PSI (4.1bar) Volume-per-stroke: 55cc Water bottle boss frame mounting bracket included. Specifications: Length: - Valve Compatibility: Presta & Schrader Max Pressure: 60 PSI Pump Type: High Volume Gauge: - Mount: Bottle Cage Bolt Mount Material: Aluminum Color: Black Weight: -