This Spider is for use on RS8 X-Type Cranks that require a Double Chainring set-up for 104 BCD and 64 BCD Chainrings
This 4 Arm 104 and 64 BCD Spider is machined from 7075 T6 Aerospace Aluminium for Maximal Strength
The Chainline is standard MTB of 50mm between the Outer and Inner Chainrings