Ultra-light, ultra-strong eccentric upper clamp for ball-bearing (without utilization of composite hub), CNC-machined from premium Swiss 7075 T6 aluminum. Eccentric top clamps enable movement associated with the rear axle 1mm forward or rearward with respect to the clamp orientation. A shorter automobile rotates faster in sluggish corners and has now enhanced forward traction. An extended vehicle is freer in high-speed corners and can feel more linear, specially during fast direction changes. Additionally black colored coated for very long life and fashionable look. Identical left/right. Fits aluminum backside bulkheads with quick & simple ride height modification. Two pieces are required for set up. Fits X12 and X1.