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 oversized 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.

Available in 28-hole drilling in red, blue, gold and black with gold hard-anodized cassette bodies or 24-hole in black with gold hard-anodized cassette body. Not recommended for riders weighing more than 45 kilos.