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Discussion Starter · #1 ·
I looked through the Spec forum and didn't find anything....and always got the best answers here, so:

I'm looking a 2010 S-Works carbon 29er HT.
The webiste shows it has a press in custom Shimano BB-91 b/b

So clue me in...is this a bb that's only available through Specialized? And does it accept regular ( like XTR) cranks?

And if anyone is using one of these b/b's...how does it hold up?
 

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Pretty sure it's like BB30 but really wide. 83mm shell?
Not positive but it seems like I remember hearing that you get an adapter to run xtr cranks.
 

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I have this fitted to my 2010 S Works Stumpy and run it with XTR M970 Cranks. The bearings are all very smooth and even save weight over the XTR external bottom bracket cups, saving me 30 grams. I would think you could get it anywhere being shimano but I got mine from Specialized as they will probably stock a lot of them.
 

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Discussion Starter · #5 ·
Ok...it's got a wide shell? Can you use a BB30 crank on it?
Or does it just use Shimano bearing pressed into a big shell?
 

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My S-Works frame came with the BB ready to accept the XTR cranks. It was my understanding that unless you get the complete bike with the Specialized cranks it comes ready for the Shimano cranks.

Mine is an 09 frame for the record.
 

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my 2010 S-Works Stumpjumper frame came with BB30 bearings also with XTR type BB91 bearings/cups

so yes the current S-Works frames work with XTR cranks

its holding up great using an S-Works crankset, seems as stiff as the XTR M970 that i was (ab)using that's now on an Epic

pic: 2010 Shimano BB91 bearings
 

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It won't work with a BB30 crank, so keep that in mind. The shell is too wide. It's Shimano/race race cranks with the adapter cups, or the specialized cranks. I think you can run a Lightning carbon crank, if you get the right spindle spacer though.
 

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No it doesn't The shell width is wider than standard BB30. You can't just put an XX crank on it. You can put cannonade cranks on it, if you have a longer spindle though. Or you can run the lightning crank if you use the correct spindle spacer. The bearings are regular BB30 sized though.
 

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briscoelab said:
It won't work with a BB30 crank, so keep that in mind. The shell is too wide. It's Shimano/race race cranks with the adapter cups, or the specialized cranks. I think you can run a Lightning carbon crank, if you get the right spindle spacer though.
I have seen a Cannondale Hollogram SL BB30 on a Specialized frame, so I am pretty sure you can run BB30. Plus, Specialized's carbon crank is essentially BB30. They have all the same parts; bearings, circlips, wave washers, and bearing shields. The only issue would be spindle length, but Cannondale and other companies that manufacturer BB30 cranks make spindles long enough to work. I know someone who's Specialized carbon cranks had not come in yet, so he tossed on his Hollogram SL's, they worked perfectly fine.

Scroll to the third page, most parts are the same:

http://cdn.specialized.com/OA_MEDIA/pdf/manuals/010 CEN S-Works_MTN_Carbon_Crank_r1.pdf
 

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That's what I just said.... you can run Cannondale cranks, because the spindle is long enough (now that they use a long spindle on all their bikes.

You can't run normal BB30 MTB cranks on it though, the spindles aren't long enough. For example, you can't run a XX crank, or an FSA BB30 crank. Like wise, you can't run a Specialized MTB crank on another BB30 bike.

Interestingly, Specialized ROAD bikes are true BB30.

Just because they use a bearing with a ID of 30mm doesn't make it BB30.
 

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briscoelab said:
That's what I just said.... you can run Cannondale cranks, because the spindle is long enough (now that they use a long spindle on all their bikes.

You can't run normal BB30 MTB cranks on it though, the spindles aren't long enough. For example, you can't run a XX crank, or an FSA BB30 crank. Like wise, you can't run a Specialized MTB crank on another BB30 bike.

Interestingly, Specialized ROAD bikes are true BB30.

Just because they use a bearing with a ID of 30mm doesn't make it BB30.
not agree ... http://www.bb30standard.com/

not run FSA ??? :rolleyes: :rolleyes: :rolleyes:
 

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briscoelab said:
That's what I just said.... Just because they use a bearing with a ID of 30mm doesn't make it BB30.
briscoelab, would you please stop bogarting what your smoking and pass it along!

i was messing with my s-works mtb crankset chainrings the other week and had to re-grease the bearings on re-assembly (with Phil Woods) - the text on the seals said BB30, when i eventually replace them with ceramics i will need size BB30.
 

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Ok guys-this is really interesting as i get many questions about Lightnings cranks fitting on those frames. Basically i'm looking for the inner width of the cranks that fits a Specialized Bike. I was told by Lightning that they would fit but i never had the opportunity to actually see one or take measure myself so if you guys have the bikes in front please let me know:

If those Shimano-adpaters are removed on the Specialized what is the frame looking like?
Is there just the frame with 85mm width and no bearings?
Which bearings do you have to fit in there?
Are these Press-fit into the frame or regular BB30 cups?
What's s the outer width then with BB30 bearings installed?

As mentioned Lightning said the cranks would fit using spacers.I have such spacers here but as mentioned have no idea how many you would need to make them fit nor where they would need to go. I once measured the inner width of the Lightnings (sans bearings) at around 95cm
 

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instead, the post #4 can help you Nino

that is the width for a BB30 crankset

you have to use Lightning without its cups

adding some spacer with 30mm ID on its spindle, to avoid play of arms
 

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eliflap said:
instead, the post #4 can help you Nino

that is the width for a BB30 crankset

you have to use Lightning without its cups

adding some spacer with 30mm ID on its spindle, to avoid play of arms
Ok-so for BB30 the outer width is about 85mm.

So the Lightning cranks sans bearings like shown above would fit with about 5mm of spacers left and right. Correct?

By the way - did the Lightning 64/104 spider you ordered fit on that Specialized crank?
 
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