SPL Parts BMW F8X Rear Upper ArmsMany of our SPL Parts are made to order. Please allow 3 6 weeks for production and delivery. Thank you! BMW F8X adjustable Rear Upper Arms (RUA) are an absolute necessity to maintain proper rear camber and reduce tire wear on the street and track. The stock BMW setup has an aggressive camber curve through bump travel, which is very apparent on lowered cars. Excess negative camber causes premature tire wear on the inside edge, and reduced traction on