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 Post subject: Bb30 crank to bb86?
PostPosted: Sun Feb 27, 2011 6:34 am 
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Joined: Wed Jun 24, 2009 6:02 pm
Posts: 222
Location: so cali
Is there any way to put a bb30 crank system (I have cannondale) into a bb86 frame type system??

Thank you.

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 Post subject: Bb30 crank to bb86?
Posted: Sun Feb 27, 2011 6:34 am 


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Sun Feb 27, 2011 9:05 am 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1703
Location: Santa Cruz, California, USA
BB30 bearing OD is 42mm. BB86 shell ID is 41mm. So it won't fit.


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Sun Feb 27, 2011 10:25 am 
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Joined: Mon Jan 24, 2005 9:41 pm
Posts: 723
Location: Uppsala, Sweden
not possible at the moment

but know that Starnut on this forum are working on a 3 piece axle for hollowgram si (the alumnium one) and sisl that will make it possible, but i gues you loose some of the benefits of bb30 with it.


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Sun Feb 27, 2011 5:21 pm 
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Joined: Fri Jul 17, 2009 4:10 am
Posts: 1146
well the OD of the BB30 bearing is 42, but you just need a bearing with a ID of 30 and OD that is less than 41.

Quick search on Boca Bearings yields this.

http://www.bocabearings.com/bearing-inv ... RU-30x37x4

$60 a pop though.

You will still have to use a longer-than-true-bb30 spindle like a Zipp Vuma quad


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Sun Feb 27, 2011 11:35 pm 
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Joined: Wed Jun 24, 2009 6:02 pm
Posts: 222
Location: so cali
Yeah, that's what I thought. Thank you guys. Hate getting some team bikes.

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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Mon Oct 15, 2012 3:13 pm 
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Joined: Wed Mar 17, 2010 5:10 pm
Posts: 18
Sorry to drag up an older post but is there a solution to this problem?

I might be getting a team Storck Fenom next year (BB 86.5), but want to try and transfer my SiSl to it as I have the Quarq spider.

Is there any way to get this to work?

Thanks for any help.


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Mon Oct 15, 2012 5:29 pm 
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Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1402
No. Not really.


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Mon Oct 15, 2012 7:32 pm 
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Joined: Mon Jan 26, 2004 7:48 pm
Posts: 127
BB86 shell is 86.5mm wide whereas BB30 is designed for 68mm width shell - the crank spindle is too short. The only 30mm spindle crank that would physically fit is a Rotor, but then you still need to sort the bearings.

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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Tue Oct 16, 2012 5:45 am 
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Location: In the industry
In short, you are trying to squeeze a short and thick rod into a long and narrow opening. Not gonna work. :D

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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Tue Oct 16, 2012 10:53 pm 
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Joined: Fri Jul 23, 2004 8:24 pm
Posts: 1524
Location: Houston, Texas
monty dog wrote:
BB86 shell is 86.5mm wide whereas BB30 is designed for 68mm width shell
Also, take a look at how your hollowgram crank mounts on the Cannondale frame and you will notice the chainrings are pretty snug against the bottom bracket sheel - i.e. no offset. That means that even with a longer spindle you are simply shifting the chainrings further out/away from the optimal chainline.

Quote:
The only 30mm spindle crank that would physically fit is a Rotor, but then you still need to sort the bearings.
In addition to the Rotor 3D+, there is also FSA's BB386 offerings for which I thought I read that SRM will be offering an SRM K-Force 386. To make the Rotor 3D+/BB386 cranks work with a BB86 frameset, Rotor UK has the Press fit 4130 BB86 converter specifically for use with BB86.

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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Wed Oct 17, 2012 1:40 am 
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Joined: Wed Mar 17, 2010 5:10 pm
Posts: 18
Thanks very much for the replies guys.

First world problems eh? Upset because I can't transfer my power meter to my new team bike ha ha


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 Post subject: Re: Bb30 crank to bb86?
Posted: Wed Oct 17, 2012 1:40 am 


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 Post subject: Re: Bb30 crank to bb86?
PostPosted: Fri Jul 04, 2014 8:35 pm 
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Joined: Fri Jul 20, 2007 4:56 pm
Posts: 614
Location: Norn Iron
Sorry to pull this old one up again folks.

If I have a Rotor 3d+ chainset, the above suggests I can get it work ok on a new Canyon Ultimate CF SLX (2014) with its press -fit 86,5. I'd that correct?

Thanks.


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