E*thirteen Helix Race 12s Cassette - 13-52T, Black Stem The Helix Race 12-Speed 9-45T

The Helix Race 12-Speed 9-45T Cassette is a drop in Gravel Upgrade

and 30mm (18

Front Derailleur

45mm for normal width cranks

Madison Optics maintain their good looks on the road or trails

E*thirteen Helix Race 12s Cassette - 13-52T, Black Stem The Helix Race 12-Speed 9-45THelix Race Cassette 12 Speed 13 52T Black Helix R 12s 13 52T Cassettes are a new close ratio gearing design, engineered specifically to optimize cadence and shift performance under load in steep terrain with frequent climbs and gravity powered descents. While the close ratio concept was conceived as a game changer for e bikes and built exceptionally strong, it's equally at home on mountain bikes and weighs in at an impressive 467g. Offering