At only 90 grams this super light topeak ninja pump hides inside your seatpost to keep the clean lines of your bike while still easily accessed when needed its rubber mounting ring secures the pump and the included position indicators keep track of your seat height topeak ninja pump features cnc aluminum barrel and handle presta valve compatible head with integrated dust ring fits into oslash272 oslash309 or oslash316 mm round seatposts inflates tyres