Hollowgram BB30 on nornal 68mm BB frame?

Discuss light weight issues concerning road bikes & parts.
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thue
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Joined: Wed Jul 23, 2008 10:29 am

by thue

I have searched, but found no matches. Is it possible?

Tokyo Drifter
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by Tokyo Drifter

zipp bb cups from a vumaquad crank and it should slip right in.

same deal with the far cheaper cups from the hive.

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GZA
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Location: Chilterns, England

by GZA

Possible if you run a wider axle - ie MTB axle with mods for a hollowgram crank, or a MTB version of a Specialized crank for example - but you will suffer from wider Q-factor and chainline changes. The mentioned cups are external so the axle needs to be wider to accomodate them.

JensW
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by JensW

you also probebly hase to machine the axle :D

you can se some of the parts you need in this http://www.cannondale-parts.de/epages/6 ... ucts/KP094

as already has been said, the q-factor will be higher

thue
Posts: 27
Joined: Wed Jul 23, 2008 10:29 am

by thue

Thanks, Guys!

The "problem" is that i have Hollogram SRM on my two SuperSIX, and I have another Hollowgram SRM in my hand. It would be nice to put it on the TT rig.

What more parts do i need, except the parts in the link, JensW?

bricky21
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by bricky21

As many others have, I've come to the conclusion that this just wont work very well. A little OT, but does anybody know if a lightning crank will fit in a specialized S-works spider, such as the S-works srm.

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BeeBee30
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by BeeBee30

thue wrote:Thanks, Guys!

The "problem" is that i have Hollogram SRM on my two SuperSIX, and I have another Hollowgram SRM in my hand. It would be nice to put it on the TT rig.

What more parts do i need, except the parts in the link, JensW?


You need to be speaking to 'Starnut', he is the world authority on fitting Hologram cranks to 68mm shells, I believe he was selling a kit at somepoint.
Ti or dye!

The Weenie formally known as CAADHEAD

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STARNUT
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by STARNUT

someone needs to sticky this thread or one of the other ones.


So here's the deal; it's not just plug and play with off the shelf parts. At a minimum the process requires a modified spindle and machined spacer to take up slack.

Image

In the above photo you can see the stock cannondale spindle on the top and the modified one below. The bearing surfaces have to be moved and the coller needs to be machined off for the thing to work. Additionally, you will need a spacer has been machined to fill the gap on the excess spindle length. The above spindles are longer than a standard BB30 104 or 103 mm from cannondale or anyone else. They were orginally designed for the Rush 2x9s which were wider for a year.

Knowing that the arms are built around a 104 spindle the stance width does increase a little with the above spindles. Also, the road spiders for the SISLs are machined with a drivetrain offset for the 104 spindle also. Because of that, the chainline on some bikes (particularly those with short chain stays) is not ideal and is spaced a little far to the DS and can become an issue.

What we're currently working on it a few things. First, we're working on machining a custom spider to correct the offset so the drivetrain works. There is obviously no work around for the SRM. Second, we're working on a carbon spider with the offset also and a spider with the BB30 offset (should be light :twisted: ). Third, I'm looking at making a new spindle from the ground up to fix the stance width. The deal is the Cannondale spindle is about 3-4 mm longer than we need. I'm trying to find a way to make one that is the cirrect length and make sure it's going to be as light as the cannodnale one and be made at a price where it is feasible to sale at retail. If I can fix it but the cost is $100 a spindle, it's not likely a viable option for retail and I wouldn't be able to sell enough to make it worth my time.

On top of all this...... I've started my own shop and we own BB30.com as well. So........ you'll have to forgive me if it seems a bit slow coming to market with this. Also, it looks like a lot of the industry is moving to BB30 anyway that or they are moving to standard where the comversion or BB30 woulnd't work anyway..... so.......

Starnut
Last edited by STARNUT on Thu Dec 23, 2010 1:04 am, edited 1 time in total.
"Don't pedal harder, pedal faster!"
Q-FACTOR IS A RED HERRING

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BeeBee30
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by BeeBee30

I rest my case 8)
Ti or dye!

The Weenie formally known as CAADHEAD

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GZA
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by GZA

Hi Starnut - ~18mm wider Q-factor right? 104mm vs 122mm axle IIRC

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STARNUT
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by STARNUT

something like that. What ever it was on the Rush a few years back. I REALLY think we can knock 3-4mm out of each side and bring it down to 1cm or 4mm on the DS and 6 mm on the NDS with a custom made spindle..

Starnut
"Don't pedal harder, pedal faster!"
Q-FACTOR IS A RED HERRING

BB30.COM

kenfucius
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Location: California

by kenfucius

Sooo, when can I buy one from you? :thumbup:

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