Weight Weenies

Is there any way to put a bb30 crank system (I have cannondale) into a bb86 frame type system??

Thank you.

BB30 bearing OD is 42mm. BB86 shell ID is 41mm. So it won't fit.

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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.

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

Yeah, that's what I thought. Thank you guys. Hate getting some team bikes.

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.

No. Not really.

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.

In short, you are trying to squeeze a short and thick rod into a long and narrow opening. Not gonna work.

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.

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.

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

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.

[quote="aarw"]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.[/quote]


Seems to me that with Rotor's 4130 you can use any BB30 crankset and have it installed on a BB86 frame? I wonder though if there is any consequences such as increased bearing resistance or decreased longevity? Anyone running this that can provide some insight?


Thanks in advance.

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Not any BB30 crankset, just those with enough spindle length (Rotor, Tune, Bor, FSA 386evo, BBright etc.)

No additional resistance there, also there is ceramic version 4130 as well Longevity is no different than most of BB30/PF30 bottom brackets, just make sure your don't over tighten your crankset (fine tune with preload ring).