BBS CH-R 20" Wheel Set - F90 M5The BBS Performance Line is a range of high performance flow formed wheels. Flow Forming increases the performance level by creating a higher quality rim area than a typical cast wheel. Many of our Performance Line wheels also have back milled spokes to remove unnecessary material. Besides looking great, these higher level technologies allow a reduction in weight (while maintaining the stiffness and durability) that will improve vehicle performance.