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PostPosted: Tue May 01, 2012 12:04 pm 
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Joined: Thu Jan 13, 2011 4:04 pm
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Location: Sunny UK
Is the Truvativ Noir GXP cank and BB cups compatible with Shimano Hollowtech II?

I measured both to have 24 mm diameter spindle so looks like they are but anyone mixed both e.g. (Shimano BB cups with the Truvativ crank)?


Last edited by 02GF74 on Wed May 02, 2012 1:15 pm, edited 1 time in total.

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Posted: Tue May 01, 2012 12:04 pm 


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PostPosted: Tue May 01, 2012 12:47 pm 
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Location: €pe
No, they are not compatible AFAIK.

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PostPosted: Tue May 01, 2012 1:04 pm 
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Truvativ/SRAM tapers to 22mm on the NDS.


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PostPosted: Tue May 01, 2012 1:43 pm 
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ricerocket wrote:
Truvativ/SRAM tapers to 22mm on the NDS.


hmmm, I didn't spot that, 24 to 22 mm should be quite noticeable, a 1 mm step :shock: ; best photo I could find on t'web is this:

Image
and another, since we all like pictures, right? :P
Image

.... and so my confusion continues .... :(

maybe it is the "lands" on the spindle that are in different places for the two BBs?


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PostPosted: Tue May 01, 2012 2:04 pm 
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why would you be confused? you have been given the correct answer. They are not compatible.


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PostPosted: Tue May 01, 2012 2:09 pm 
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.... because if they are the same spindle diameter, how come they don't fit?


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PostPosted: Tue May 01, 2012 2:48 pm 
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Joined: Sun Feb 05, 2012 7:00 am
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Location: Gold Coast, AUS
02GF74 wrote:
.... because if they are the same spindle diameter, how come they don't fit?

think you are missing the point, they are only the same size on the drive side, the NDS is 22mm on GXP.
http://www.bikyle.com/bottom_brackets.htm


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PostPosted: Tue May 01, 2012 9:04 pm 
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The NDS bearing contacts the splined portion of the spindle, not the smooth section. You can actually see the step in the pictures you've provided on the splines.

As stated repeatedly above, they definitely are not compatible.


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PostPosted: Wed May 02, 2012 11:28 am 
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ok, sorry if I appear to be non trusting but it is my nature to question whenever I see something but am told something else so I like to understand. :?

a close look at the chainset indeed showed polishing on the splined section where the ND bearing made contact, not the way I would have designed it but ......

I wonder if making a shim form a stip of 1 mm thick aluminium would work??? :noidea:


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PostPosted: Wed May 02, 2012 1:04 pm 
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GXP BB is like $20-$30...


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PostPosted: Wed May 02, 2012 1:49 pm 
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Location: UK
Hope make an adaptor so that you can use Truvativ / SRAM GXP cranks with their own BB, maybe one of those would fit a Shimano BB as well?


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PostPosted: Thu May 03, 2012 4:40 am 
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Location: New Hampshire
They're incompatible, and that's that. Just buy a new BB, they're cheap. Don't futz around with shims or adapters, get the parts that work.


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Posted: Thu May 03, 2012 4:40 am 


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