Shimano Press Fit / BB71 Bottom Brackets confusion ...

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Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby PaulMoran » Thu Oct 11, 2012 7:10 am

Hi All -

potentially retarded question - but the multitude of BB standards leaves me fairly confused ....

What road cranks are compatible with the Shimano Press Fit BB71 BB ?

and are there any adapters to use BB30 cranks in this BB71 ?

I like the FSA K-Force Light compact crankset ....but looks like its only made for BB30 or MEGAEXO or 386EVO ...

thanks for clearing this up - cheers

Paul
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by BNA » Thu Oct 11, 2012 12:09 pm

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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby MichaelB » Thu Oct 11, 2012 12:09 pm

This is a good document (published by FSA) with an FSA viewpoint.

Also shows how screwed up all the "standards" have become, much like headsets ...

Such a PITA ....

http://www.qbp.com/diagrams/TechInfo/FSA/externalbbfitchart.pdf
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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby PaulMoran » Thu Oct 11, 2012 12:21 pm

Thanks Michael -

just had a quick flick through .....but cant see the BB71 outlined anywhere ?

another example here - http://www.giant-bicycles.com/en-au/bik ... ifications

"Dura-Ace Press Fit" ...u reckon i could safely assume this a a PF30 BB ??

so (freaking confusing!!)

Cheers for your help mate!!

Paul
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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby MichaelB » Fri Oct 12, 2012 10:31 am

Next option is to contact a manufacturer of adaptors (such as HSC Ceramics in Aus) and ask.

Just specify what frame you have and what crank, and they'll set you straight

http://www.hscceramics.com.au/HSC-Bike-Ceramic-Bottom-Bracket/onlineshop-BottomBracket.html

Have a look here, as it states the shell ID's and widths, so you may need to measure to get a better understanding of what you actually have.

Whether ceramics are worth it, is another thread entirely :wink:
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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby old al » Thu Oct 18, 2012 6:50 pm

Good video on bottom bracket standards. No mention of BB71 though.

http://www.youtube.com/watch?v=AftPKuX_tyo

Al.
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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby ozdavo » Thu Oct 18, 2012 7:27 pm

Shimano BB71 press fit is not a standard, but a model of BB. I believe it conforms to BB86 standard, and suits Shimano Hollowtech II cranks.
http://tbsm.com.au/bike-parts/drivetrain/bottom-brackets/shimano-sm-bb71-press-fit-road-bottom-bracket-
Always looking for new rides & ride partners in SE QLD area
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Re: Shimano Press Fit / BB71 Bottom Brackets confusion ...

Postby Nobody » Tue Mar 12, 2013 6:17 pm

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