e*thirteen Helix Race Cassette - 12-Speed 9-52t Naranjae*thirteen Helix Race Cassette 12 Speed 9 52t Naranja. The e*thriteen Helix Race 12 speed 9 52t cassette is engineered to deliver precision shifting performance with an industry leading 578% gear range. The proprietary 9 tooth smallest cog combined with the 52t largest cog enables the use of a smaller chainring for improved clearance lighter system weight and a lower bail out gear ratio without high gear compromise. Seamless cross compatibility with