So, you have been turned on to this e-bike thing – good for you! We are stoked to offer an eMTB Spider to run 104BCD rings on your e-bike. This spider is only compatible with the Bosch Gen 4 Performance Line CX and SX motors. Any Race Face 1x 104BCD ring will mount securely with the included hardware. - including our new SHI-12 speed rings!