The VumaChrono crankset is a breakthrough in terms of aerodynamics but it wouldn't have been possible without all the advances of the VumaQuad, the world's lightest crankset at 580 grams. External BB with 30mm spindle that fits in standard English bottom brackets Does not include BB cups Ceramic and steel BB cups available 30mm spindle diameter Compatible with Zipp BB cups only Exceeds 2007 CEN crankset fatigue testing standards Item Specifi
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