Bb30 crank to bb86?

Discuss light weight issues concerning road bikes & parts.
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jediknights
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by jediknights

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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eric
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by eric

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

by Weenie


JensW
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by JensW

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.

nitropowered
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by nitropowered

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

jediknights
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by jediknights

Yeah, that's what I thought. Thank you guys. Hate getting some team bikes.
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GoesLikeStink
Posts: 18
Joined: Wed Mar 17, 2010 5:10 pm

by GoesLikeStink

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.

bricky21
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by bricky21

No. Not really.

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monty dog
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by monty dog

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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elviento
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by elviento

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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ms6073
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by ms6073

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.
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GoesLikeStink
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by GoesLikeStink

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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aarw
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by 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.

xntrickly
Posts: 101
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Location: North Texas USA

by xntrickly

[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.

by Weenie


aspms
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by aspms

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).

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