SRAM X-Sync Chainring, 107mm BCD x 4-Bolt 1x12-Speed, Polar Grey (SRAM Red) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button... SRAM X-Sync Chainring, 107mm BCD x 4-Bolt 1x12-Speed, Polar Grey (SRAM Red) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button...