CIRCO S83 Race Brake Pads BMW M3 (E92) / M5 (E60) / X5MCIRCO S83 Friction Summary: 0. 32 0. 36 Temperature Range: 0 600C Low metallic Carbon Rear Race Pad for RWD Entry level trackday Good modulation Low Medium friction CIRCO S83 is a performance street & entry level track day compound also used extensively in rear axle competition configurations where friction repeatability is important along with a reduction in bite towards the end of a stop. This helps to reduce the likelihood of rear locking when the