We designed the super-lightweight Harmonic hubs to meet the needs of the raddest little riders. Starting with cold-forged 6061-T6 hub shells we added oversize aluminum front axle and rear axle bolts a Shimano-compatible 7075-T6 aluminum casette body and smooth-rolling sealed bearings. A proven reliable 3-pawl cassette body ensures solid engagement every time. Each set also includes a color-matched aluminum BOX Edge Lock Ring and a gold BOX Zero Cassette Spacer Kit. Not recommended for riders weighing more than 120 pounds.
