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Specialized S-Works b/b?

3700 Views 39 Replies 13 Participants Last post by josliver, Dec 23, 2009

the mayor

Discussion Starter · Dec 20, 2009

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?

1 - 20 of 40 Posts

COLINx86

· #2 · Dec 20, 2009

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.

Pete N

· #3 · Dec 20, 2009

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.

eliflap

· #4 · Dec 20, 2009

COLINx86 said:
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.

look :thumbsup:

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the mayor

Discussion Starter · #5 · Dec 20, 2009

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?

amillmtb

· #6 · Dec 20, 2009

the mayor said:
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?

Yes. BB30 works, you just have to extract the bb-91 cups and then go through the process of pressing the bb30 bearings.

pop_martian

· #7 · Dec 20, 2009

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.

culturesponge

· #8 · Dec 20, 2009 (Edited)

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

briscoelab

· #9 · Dec 21, 2009

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.

eliflap

· #10 · Dec 21, 2009

the 26" version Epi carbon has BB30 crank

briscoelab

· #11 · Dec 21, 2009

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.

amillmtb

· #12 · Dec 21, 2009

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

briscoelab

· #13 · Dec 21, 2009

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.

eliflap

· #14 · Dec 21, 2009

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 ???

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culturesponge

· #15 · Dec 21, 2009

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.

nino

· #16 · Dec 21, 2009

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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eliflap

· #17 · Dec 21, 2009

this is the width for an XTR crank

with BB91 press fit bearing installed on

BB91 are internal bearings + ID reducer to use 22 mm spindle as XTR

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eliflap

· #18 · Dec 21, 2009

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

nino

· #19 · Dec 21, 2009

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?

eliflap

· #20 · Dec 21, 2009

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

not yet tried

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