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 Post subject: XTR M960 BB questions...
PostPosted: Wed May 16, 2018 2:54 pm 
Gold Trader
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Joined: Mon May 14, 2007 11:28 pm
Posts: 5205
Location: Scotland!!!!!! Yay, at last, only 4 years waiting!
So I need to replace my BB, and the one fitted is not the original, so I have two questions after lots and lots of online research.

1. What is the model number of the correct BB for this groupset? The bike is all M960 and M965 so in a way I'd like to replace with an original, but wow, that's been hard to research!

2. Would a modern day XT level MT800 BB be perfectly suitable? Got to be pretty good quality and CRC have them for like £13!

Cheers


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 Post subject: Re:
PostPosted: Wed May 16, 2018 3:59 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
I believe all the HTII style will be fine, newer versions have improved bearing/seals but also use a smaller outer cup.


Here's some modern retro docs
archive - Shimano Product Website
PDFproductinfo.shimano.com › download
http://productinfo.shimano.com/download ... ity_en.pdf


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 Post subject: Re:
PostPosted: Wed May 16, 2018 11:35 pm 
Gold Trader
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Location: Scotland!!!!!! Yay, at last, only 4 years waiting!
It’s weird the B.B. is like spares numbers rather than actual model numbers, as though it was a component part of the cranks


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 Post subject: Re:
PostPosted: Thu May 17, 2018 7:30 am 
retrobike rider
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Location: Yorkshire, England
It is a component part of the crank.
It comes as one.


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 Post subject: Re:
PostPosted: Thu May 17, 2018 7:33 am 
Gold Trader
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Joined: Mon May 14, 2007 11:28 pm
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Location: Scotland!!!!!! Yay, at last, only 4 years waiting!
Right so that B.B. was never available as a separate unit then? So weird!


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 Post subject: Re: Re:
PostPosted: Thu May 17, 2018 7:40 am 
retrobike rider
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Location: Yorkshire, England
development_cycle wrote:
Right so that B.B. was never available as a separate unit then? So weird!


It probably was, even today's are all part numbers and have no code and they are not even mentioned they are available as a while unit.
But they wear out and I guess they must be as we can see them sold all over the place.


I think it was just an XT LX Home bottom bracket iirc, never used them myself as I didn't join HTII and the modern world till 2010.

Looking at CRC the Bb52 (sm-bb52) is the style of the older 760/770 etc bottom brackets.

Everything else has the newer cup design it seems.


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