Ultra-light, ultra-strong eccentric top clamp for ball-bearing (without the need for composite hub), CNC-machined from premium Swiss 7075 T6 aluminum. Eccentric top clamps enable motion from the back axle 1mm ahead or rearward in line with the clamp orientation. A shorter automobile rotates faster in slow corners and possesses now improved ahead traction. A protracted vehicle is freer in high-speed corners and will feel more linear, particularly during quick means changes. Also black colored colored colored coated for long life and fashionable appearance. Identical left/right. Fits aluminum rear bulkheads with fast & easy journey height modification. Two pieces are needed for make. Fits X12 and X1.