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VumaQuad
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 Zipp’s engineers were able to achieve that benchmark with a design that’s stiffer than any other crankset we’ve 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 VumaQuad’s 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 after market ceramic gold cups and bearings (sold separately) and a purpose-designed installation tool made by Pedro’s. 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 – 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.
“Fuori i muscoli!” by Alessandro Turci, Ciclismo February 2009
The Italian magazine, Ciclismo, reviews Zipp's 808, SLC2, SL145, Tangente Tire, VumaQuad and 88/188 hub.
Cyclingnews.com
VumaQuad Review June 2008 "…the VumaQuad is a stellar bit of kit and well worth it if you can afford the cost. As always, being the best never comes cheap.
Crank Spare Parts Diagram [pdf]
Download a pdf with an exploded diagram of the VumaChrono and VumaQuad and part numbers.
Si3N4™ (Silicon Nitride Ceramic Bearings)
Silicon Nitride (Si3N4) ceramic bearings are 30% lighter than steel and 40% stronger. Each ball is over 1000X more round than the best steel bearing of any type, grade or benchmark. |




