Anyways, i still think that they are light, stiff and beautiful. My complain is that they are no resistant enough. The first problem was with a chainring thread; it dies and i had to made a bigger hole to put a regular chainring bolt. Anyways, not a big deal.
But some months ago, i feel some play in BB. At first i think that the bearings had some kind of movement in the BB, but when i dismounted it i find that was the aluminium axel that had looseness with the carbon rod. It already was a big deal .
And here i show the proces i did to repair it:
The first thing I had to do was a tool to remove the left crank nut...
DSC02992 por monchito3000, en Flickr
... and a tool to separate the axel from de crank.
DSC02990 por monchito3000, en Flickr
Here are some weights:
DSC02984 por monchito3000, en Flickr
I thought in lightening the axis, but finally it seems to me a litle bit dangerous.
DSC02986 por monchito3000, en Flickr
then I needed a device to glue the rods perfectly aligned.
utillaje por monchito3000, en Flickr
and a centered substitutes for pedal axles.
centrajes biela por monchito3000, en Flickr
before glue the cranks I realized that the left crank nut would not tighten against carbon fiber, so I had to fill it with epoxy putty. This particular case is inexcusable and I think it's because of a poor design. The nut should not have been just a embellisher.
DSC02994 por monchito3000, en Flickr
and finally i could glue the cranks:
DSC03139 por monchito3000, en Flickr
DSC03140 por monchito3000, en Flickr
DSC03114 por monchito3000, en Flickr
as glue i used a mix of epoxy and these little pieces of carbon fiber
DSC03095 por monchito3000, en Flickr
And here the cranks completed.
vuma quad repaired por monchito3000, en Flickr
I hope to use the cranks for a few years more. May be i´m too naïf, but I think a +1000€ cranks should not have given me any problem, at less, not so soon. Anyways, it still seems a happy ending.
Please be sure to revisit this post to give an update on how they run when reinstalled and in use.
Those cranks are beautiful and unfortunately proprietary. Good on you for giving them a new lease on life.
Thats looks like a job very well done - but you will have to see if they hold up!!
I have the exact same problem (as i am sure do many). So I bought a new crank and have my old Vuma sitting in my shed as i dont know what to do with it!! If your process works I could pay you to fix mine
- Mattias Hellöre
- in the industry
- Posts: 554
- Joined: Fri Sep 23, 2005 6:34 pm
- Location: Insjön, SWEDEN
If the manufacturer stops producing things.Ask yourself why? A big fail in business math to stop selling something that is paid for.
The second problem here and many many cranks have is the corrosion, in the end the bond don´t hold up. Sometimes it´s just a lemon.
My experience is not only theorethical, I have broken Storcks, Lightning and so on here in my shop.
At moment i didn´t too many Kms. You know, winter and so... But with around 300 Kms did not appear any problem. Anyways, i want to wait to climb some ports with suffering and misery before claim victory. Then i´ll be glad to repair yours.
I'll keep you informed.
!!!!For the eternal eye of Sauron¡¡¡¡
So i have to disassemble and see if it´s the side i already repaired or if it´s the other side, and i don´t know which could be worst.
i´m beginning to hate Vuma´s.
Here are the pictures:
Eje 2º intent por monchito3000, en Flickr
Eje 2º intent (2) por monchito3000, en Flickr
Past time i didn´t care about temperature or cure times and just scratched the aluminium with too much faith in epoxy´s adhesive power.
I really hope not have to repair it again.
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