E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Bronze - 9-50T - 12 Speed algolia-ignore The Topaz Air comes with

The Topaz Air comes with a 3 position lever giving you the option to switch between three compression settings on-the-fly for climbing

A specially-designed lightweight frame provides a wide and tall field of view through the high quality lens

Wheels sold separately

Who they are most certainly for is those who like choice

E-Thirteen Helix 12 Speed Race Cassette - XD Driver - Bronze - 9-50T - 12 Speed algolia-ignore The Topaz Air comes withThe HELIX R Cassette is an upgrade to any SRAM Eagle or Shimano drivetrain, with more range than any other cassette on the market. The 9 tooth cog lets you step down one chainring size while keeping the same top end gearing and provides not only better ground clearance but an overall lighter drivetrain. The improved tooth profile of the Helix cassette's features Shimano 12 speed level shifting performance with the improved reliability of a steel and