The maxxis welter weight 275 tube have been engineered for aggressive riders who require durability in their inner tubes these are the middle weight tubes from maxxis and they have 09mm thick walls to resist punctures these tubes are perfect for all types of riding and they39re available with either a presta or a schrader valve for effortless inflation these welter weight inner tubes won39t flatten easy and they39re designed to fit 650b tyres the perfect size for quick