White Industries V2 VBC Chainring 2x Set- Square TaperThe new v2 VBC (Variable Bolt Circle) 2x 12 speed compatible chainrings are compatible with Shimano and SRAM 9 12 speed 2x drivetrains. That includes Shimano 9 12 speed 105 Ultegra GRX Dura Ace and 10 12 speed SRAM Apex Rival Red, in either mechanical or electronic versions. They retain the Variable Bolt Circle feature that allows up to five different size inner rings to be mounted on the same outer ring, with 33 possible gear combinations across the