XRAY have introduced an aluminium upper eccentric clamp for ball-bearing for the X12 and X1. The ultra-light, ultra-strong eccentric upper clamp for ball-bearing (without use of composite hub), is CNC-machined from premium Swiss 7075 T6 aluminum and comes black coated for long life and stylish look. Eccentric upper clamps allow movement of the rear axle 1mm forward or rearward depending on the clamp orientation. A shorter car rotates faster in slow corners and has improved forward traction. A longer car is freer in high-speed corners and will feel more linear, especially during fast direction changes. Fits alu rear bulkheads with quick and easy ride height adjustment.