ALUGEAR 2x Aero Chainring for Shimano GRX - Black BX PSI Enables wireless communication for E-Tube

Enables wireless communication for E-Tube programming with smartphone or tablet

Reach: 72mm (68mm for 380mm bar)

ICE TECHNOLOGIES FREEZA construction for outstanding heat dissipation

foam rings and seal rings

ALUGEAR 2x Aero Chainring for Shimano GRX - Black BX PSI Enables wireless communication for E-TubeChainring set 2 speed ROUND AERO for Shimano GRX FC RX820 2 (12 speed), FC RX810 2 (11 speed) Specifications Intended to use: 2X 12 speed and 2X 11 speed for Gravel bike Optimum chainring combinations: 46 32; 48 34 Mounting position: outside 46T; 48T; inside 32T; 34T Bolt circle diameter: 110 mm Shimano Asymmetric (GRX versions outer chainrings), 80 mm Shimano Asymmetric (GRX versions inner chainrings) Attachment: 4 arm spider Material: Aluminum 7075