Replace your worn out or flat bike tube with the Nishiki(R) Schrader Valve 27.5'' 2.125 Bike Tube. This bike tube is designed to fit 27.5" tires and that are 2.125 wide, and features a Schrader valve that is 35mm in length. You'll be prepared for the rocky trails with the Nishiki(R) Schrader Valve 27.5'' 2.125 Bike Tube. FEATURES: Replacement bike tube Best for mountain bikes Fits 27.5" tires that are 2.125 wide Valve type: Schrader Valve length: 35mm Tube width: 50mm Tube thickness: .95mm