The maxxis freerider 650b tube sv has been designed to handle the rough terrains of freeride these maxxis tubes have 12mm thick walls for optimum puncture resistance so you can ride for longer without flatting these freerider tubes have a schrader valve and they won39t add any unnecessary weight to your bike as they only weigh in at 317g these schrader inner tubes have been designed for 650b wheels the perfect size which offers enhanced traction and provides you with nimb