At only 62 grams (2.2oz), the super-light Ninja mini-pump hides inside your seatpost, keeping the lines of your bike visually clean yet remaining easily accessible when needed. A rubber mounting ring secures the pump, while the included position indicators track of your seat height. The Ninja Mini-pump is compatible with round seatposts only.Features: Inserts into 27.2mm, 30.9mm or 31.6 mm round seatposts Dust ring keeps the pump head clean Rubber mounting ring secures the pump Includes seatpost position indicators Head: Presta valve with integrated dust ring Size: 8″x0.8″x0.8″(20.3cm x 2.1cm x 2.1 cm) Weight: 62g (2.19oz) Capacity: 160psi (11bar)

Available at amazon.com for $26.09