When biking on rocky terrain and all day riding on the trails, keep a spare bike tube in case of flats with the Nishiki(R) Presta Valve 29'' 2.4-2.75 Bike Tube. This bike tube fits your 29'er mountain bike and is equipped with a Presta valve that is 33mm in length. It fits tires that are 2.4-2.75" wide and will get you back on the trails in not time. Features: Replacement bike tube Ideal for mountain bikes Fits 29" tires with a width range of 2.4-2.75" Valve Type: Presta Valve Length: 48mm