That's great. Really well done to you! You're right though... they shouldn't have given in so easily... guess it's why zipp and easton stopped making their cranks - too much hassle with warranties / failures!

Or it could be that SRAM purchased us after we developed that crank, which was rather expensive to make in the US.

Subsequently, the new Red crank was in development with a similar target mass and a price ~50% lower than the Vuma Quad. Pretty obvious business decision to discontinue our crank, really.

monchito, impressive work. Can I ask why you didn't send the crank in for warranty?

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Zippy engineer

Hello, Waldo.

I didn´t send the cranks for warranty because i thought that the warranty was over (more than 2 years), and because the shop i bought it, here in Barcelona, are probably the more slow acting way people in the world. What in any shop could be 2 days, in this shop will be more than 2 months for sure.

But the principal reason was that i thought that i could fix it, and control all the process. (and just two days without the cranks in my bike )

cllrhodgen, mnmasotto and you all, thanks for your comments , i really appreciate them.

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6.243 Gr with Ksyrium clinchers wheels

Repairing Vuma Quad

So did the repair work this time?
I have one with the drive side loose. I highly doubt that can be fixed.

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Eric in San Mateo, CA

Monchito, what type of play are you feeling in the cranks?
Lateral - side to side, or vertical - pedaling one crank forward and the other backward?
I've got one set with mild vertical play. Feels like a bad freehub or failing bb bearings when pedaling, but it's indeed the VumaQuad but I've yet to isolate the issue or attempt a repair. Not sure if this is what you are feeling as well.

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My Addict
Her Addict
My Cycling Blog

Was it cold there just before the bond failures ? aluminum (the axle) shrinks A LOT more than carbon/epoxy (the crankarm) and it might be possible that thermal issues have contributed to the failure ?