The VumaQuad Italian BB Ceramic Bearing Cups Pair is a threaded bottom bracket conversion kit designed for 70 mm Italian-threaded frames. The kit comprises a left and right aluminum cup that thread into the frame shell and house high-precision ceramic cartridge bearings, providing ultra-smooth rotation and long-term durability. It’s engineered to fit Zipp VumaQuad and VumaChrono cranksets (BB30 interface) in Italian-threaded shells, allowing riders to use those cranksets on frames without BB30 press-fit shells.

• Shell compatibility: 70 mm Italian-threaded bottom bracket (36 × 24 TPI)

• Includes: two anodized aluminum bearing cups (left and right)

• Bearings: sealed ceramic cartridge bearings (typically 6805 size) for reduced friction and extended service life

• Interface: accommodates BB30 spindle cranksets, specifically Zipp VumaQuad and VumaChrono

• Installation: thread-in cups with hand tools or adjustable BB wrench; no frame modification required

• Maintenance: fully serviceable bearing cartridges; cups protect bearings from dirt and moisture