Guolio rutuliukas CeramicSpeed Silicon Nitride 5,000mm (101304)

5,000 mmThe outstanding finish quality of the CeramicSpeed Balls is essential for ensuring that our bearings and bearing products deliver extreme performance combined with unmatched longevity.400% smoother, 128% harder and 58% lighter than the standard steel balls, typically used in bicycle components, the CeramicSpeed Balls guarantee that you can ride faster using less energy.