The VumaQuad is a 4-arm compact crank fits the emerging 30mm BB standard, has a 300mm spindle and 22mm bearings. We offer both compact 50/34 and standard 53/39 extra stiff chain rings fitted to a 100mm bolt circle and attached with "NoNuts" system to reduce weight and increase overall crack stifness. 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.

There is a ceramic bearing option (with gold bearing cups) comprising ABED 7 races and Grade 2 balls. Our standard (gray bearing cups) option with ABEC 5 races and Grade 10 steel balls is already 2.5 times rounder than the industry norm.