Zipp Vuma Quad Carbon Chainset

Passed the new increased CEN fatigue test at the new standard of 1800 Newton's The Vuma Quad tested beyond 100, 000 cycles at 1800 Newton's.

The Vuma Quad is a 4-arm compact crank fits the emerging 30mm BB standard, using a 30.0mm spindle and 30mm bearings. This crank set is 33% stiffer than the next lightest product on the market and. The spindle is aluminum 30mm, with a unique design that allows for weight reduction while retaining structural integrity and durability.

This all new four-arm spider comes with your choice of 50/34 or 53/39 chain ring, in a 110mm bolt circle for extra stiffness and in 170, 172.5, 175 and 180mm lengths for the really discerning rider. Our bonding system is 3 times as strong at holding two separate lugs giving a super light, extra stiff crank. The extra stiff chain rings are fitted to a 110mm bolt circle and attached with "NoNuts" system to reduce weight and increase overall crank stiffness. Stiffer chainrings also aid shifting as the front mech feels more responsive when moving the chain from ring to ring.

The smaller chain ring is threaded, so we use a larger diameter bolt to increase thread engagement, reduce weight and stiffen the chain ring - crank arm interface. The bearings are USA made with ABEC 5 grade races and Grade 10 steel balls, no less than 2.5 times as round as the rest of the industry.

The Vuma Quad is compatible with all frames that have a 68mm wide bottom brackets with either 1.37" X 24T English threads or 36mm X 24T Italian threads. It has also been future proofed for compatability with the BB30 system. The Vuma Quad is designed to work with only the VumaQuad bottom bracket bearing cups, which come in either a standard version or a ceramic version(not supplied).

Caution: Possible Interference Between Vuma Quad Spindle and Cable Guide Bolt
There may be interference between the 30 mm spindle of the Vuma Quad and the cable guide bolt on some bikes. The 30 mm spindle of the Vuma Quad has less clearance between the spindle and inner diameter of the bottom bracket shell than most other bottom bracket spindles. This is allowed by the use of external bearing cups. The reduced clearance means less room for anything to protrude into the inner diameter of the bottom bracket shell. The cable guide on many bikes is held to the bottom side of the bottom bracket shell using a bolt that goes through the shell.

One should take care while installing the Vuma Quad to make sure the cable guide bolt cannot come into contact with the spindle. If it can, a shorter bolt should be used in its place before installing the Vuma Quad.