Box 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 cassette body and smooth-rolling sealed bearings. A proven reliable 4-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. Weight: 383 grams complete with lock ring and four spacers.