cannondale bb30 and vuma bearings will it work? starnurt?

Discuss light weight issues concerning mountain bikes & parts.

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limon
Posts: 23
Joined: Tue Jan 25, 2005 12:05 am
Location: waukegan, IL

by limon

I'm trying to make this work on a 68mm bb, what do you think?
ideas welcomed.
thanks
Attachments
bb 001.JPG

MaestroXC
Posts: 487
Joined: Thu Oct 05, 2006 3:23 am

by MaestroXC

No, it won't.
Zealots beware.

by Weenie


JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

you have spacers on the drive side, and a "edge" on the other side that goes againt the bearing, right?

what about removing that edge, and use spasers on both side, wouldn´t that clear som space for the outer bearing cups? i´m not sure that will work, but that´s one idea

cswi9367
Posts: 1390
Joined: Wed Feb 01, 2006 1:40 pm

by cswi9367

i think this will work. the key is getting the right width spindle.

i agree, i think you will need to machine down the edge.

if i had it all in hand, im sure i could get it to work with some mill/lathe work. keep us all posted!

JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

was so close to try this modification earlier, just before i got my extra lite crankset. so would be intresting to se if it´s possible

kommando52
Posts: 5
Joined: Sun Sep 16, 2007 11:31 am
Location: France

by kommando52


JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

looking at this picture, there seams to be room for a external bearing if the edge is removed and is replaced with a spacer


Image

cswi9367
Posts: 1390
Joined: Wed Feb 01, 2006 1:40 pm

by cswi9367

by that picture, i dont know. problem is you need something to squeeze the spindle to keep it from sliding left and right. if you get rid of that lip, how are ou going to keep the spindle centered in the BB, unless it has some shoulder to keep it in place. that shoulder would have to be more towards the center of the spindle than where it is now. this would allow the vuma piece to squeeze against it somehow.

wish i had all this stuff in my shop...i'd get something completed.

JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

cswi9367 wrote:by that picture, i dont know. problem is you need something to squeeze the spindle to keep it from sliding left and right. if you get rid of that lip, how are ou going to keep the spindle centered in the BB, unless it has some shoulder to keep it in place. that shoulder would have to be more towards the center of the spindle than where it is now. this would allow the vuma piece to squeeze against it somehow.

wish i had all this stuff in my shop...i'd get something completed.


why not use spacers between the bearings and the crankarm, as you do on the drive side?

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tortor
Posts: 68
Joined: Sat Jan 27, 2007 12:40 pm

by tortor

JensW wrote:looking at this picture, there seams to be room for a external bearing if the edge is removed and is replaced with a spacer


Image


This is my Sola :D And I can tell you that it works 8)

I finished this afternoon the work (with the help of a friend who is cnc specialist).

A few more pictures later ...

Finaly I mounted the axle on the reverse way. This side was mounte on the rings side.

We reworked the axle with a cnc machine, to add an aluminium ring at the left bearing place. It was fixed with loctite and than sized with rhe cnc machine to 29,98mm.

It works perfectly.

I also change the THM bearings with the Cannondale ceramic ones delivered with the SI SL Hollogram crankset.
This is 180 gr less thanthe XTR crankset :D :D :D
Last edited by tortor on Sat Mar 01, 2008 5:05 pm, edited 1 time in total.

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tortor
Posts: 68
Joined: Sat Jan 27, 2007 12:40 pm

by tortor

limon wrote:I'm trying to make this work on a 68mm bb, what do you think?
ideas welcomed.
thanks


You can have a look on this post :
http://julmtb.com/forum/viewtopic.php?t=12814&start=90

Image
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JensW
Posts: 763
Joined: Mon Jan 24, 2005 9:41 pm
Location: Uppsala, Sweden

by JensW

wow, great work

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cerro
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Location: Stockholm, Sweden
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by cerro

Great work tortor. Really nice looking. 590g?
/jonas l
http://cerrol.wordpress.com (my cyclingblog)

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tortor
Posts: 68
Joined: Sat Jan 27, 2007 12:40 pm

by tortor

cerro wrote:Great work tortor. Really nice looking. 590g?


Thanks.

610gr with the THM bearing cups, ceramic bearings, axle, bolts, crankset.

Now I will change the transmission to XO (rear derr. and Triggers), D-A double for front derr. and Disc brakes Marta SL.

Normaly 8,900 gr. Today 8,980gr. Size 18,75 inches.

saletel

by saletel

Hows your chainline looking?

by Weenie


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