What Our Gearhead(R) Experts Are Saying: "This upgrade took my wheels to another level. Smoother rolling, noticeably better power transfer, and you can feel the reduced drag on long rides. Installation was a breeze, and knowing they're hand-built just adds confidence to the quality." We demand every watt counts-on the flats, in the break, or grinding up alpine grades. That's why we trust the Zipp Ceramic Bearing Upgrade Kit, featuring CeramicSpeed's industry-leading grade 3 Silicon Nitride balls. Hand-built in Denmark and matched to polished steel raceways with micrometer precision, these bearings offer a near-frictionless spin that maximizes speed and durability. Whether we're building out a race-ready setup or fine-tuning our daily driver, the non-contact sealed design keeps contaminants out while CeramicSpeed's Blue Grease keeps performance smooth and consistent. The payoff? Reduced rolling resistance, improved power transfer, and longer service life-across every road discipline we ride.