Ethirteen Helix Sram XD Cassette 12s 9-50T S3-Size-18x2.5mm This bike seat can be

This bike seat can be used with a frame or carrier mount system

Impact resistant 4 layer TPU toe box with 2mm of impact resistant foam

Aggressive terrain calls for a helmet that’s just as intense

Provides smooth horizontal and rotational adjustments

Read more about the EQ air spring below

Ethirteen Helix Sram XD Cassette 12s 9-50T S3-Size-18x2.5mm This bike seat can bee*thirteen Helix Race Cassette 12s 9 50T Eggplant Purple Suitable for Dram XD and XDR drivers Helix Race 12 speed, 556% Range, 384g More Range, Less Weight The HELIX Race Cassette is an upgrade to any SRAM Eagle 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.