The AXA HR Traction Power Control dynamo is one of the most renowed side running dynamo's on the market. With the latest technique and the extra big runner this dynamo offers you the highest efficiency effortless. The double bronze bearings and stainless steel shaft form the base of an extra long life cycle for the product. When your runner is worn out, it can easily be replaced by a new one for extra grip. The HR Traction also comes with an overvoltage diode, which prevends your lights from burning.