This spider mount sits between the Gen 4 CX Bosch drive unit and the outer 4 bolt chainring. Compatible with the Bosch Gen 4 Performance line CX. This is the Non-Boost version with no additional offset. If you need the offset 'Boost' version click here.
Allows the motor to take a standard 104 BCD chainring. Chainring bolts not included.
Be aware this is non-boost
Purchased for my Decathlon Stilus, less weight even with new Chain ring.