Zipp VumaQuad Crankset w/Ceramic BB Weighing as little as 580 grams, it's the lightest crankset and bottom bracket system ever to pass the rigorous CEN testing protocol for racing bikes. But the true brilliance of the VumaQuad is that Zippâs engineers were able to achieve that benchmark with a design thatâs stiffer than any other crankset weâve tested, except for our own VumaChrono. The heart of the VumaQuad is its unique 4-bolt chainring system that allows you to switch between standard 53/39 and compact 50/34 chainrings. For increased thread engagement and system stiffness, three bolts thread directly into the small chainring while the fourth is integrated into the crankarm. The chainrings themselves are specially designed to shift flawlessly without flexing, even when sprinting out of the saddle. The VumaQuadâs 146mm Q-factor is the narrowest available and its 30mm spindle is the largest and stiffest ever used in a traditional bottom bracket. The VumaQuad system includes our bottom bracket with impeccably smooth grade 3 silicon nitride ceramic bearings and a purpose-designed installation tool made by Pedroâs. The VumaQuad is compatible with BB30 bottom brackets when used with the optional spacer kit. Available in four lengths from 170-180mm with 53/39 or 50/34 chainrings. Replacement chainrings are available in the Zipp online store. Caution â the new Shimano 7900 chain requires extra care and finesse to work properly with VumaQuad chain rings. We recommend you use the 7800 chain as this will improve shifting and performance. NOTE: The 7900 chain does not appear to use a standard 1/2" pitch as all previous road chains and will therefore show irregularities in shifting performance with all 1/2" pitch chain rings including Zipp rings as well as other Shimano rings.
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