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Carbon Frame and BBSHD

Posted: Jan 10, 2018 5:16 pm
by barbs00
Hi All,

I have the chance to get a really cheap Giant anthem advanced 2016 - Carbon frame bike.

I would like to add my BBSHD motor to this frame.

Are there any issues using a carbon frame with a BBSHD mid drive?

Cheers

Re: Carbon Frame and BBSHD

Posted: Jan 11, 2018 2:18 am
by amberwolf
There's been some discussion of BBS* and carbon frames; in case they're useful, here's a few threads with those in the title (there's probably other individual posts or threads without that in the title that have info too)
https://endless-sphere.com/forums/searc ... mit=Search

Re: Carbon Frame and BBSHD

Posted: Jan 11, 2018 7:22 am
by barbs00
Thanks Amberwolf.

I went out to see the bike today and unfortunately the bottom bracket is around 90mm and the BBSHD I wanted to fit (already have it) is the standard 68-73mm version. Damn!

I am guessing the answer is no....but is there any way to make this fit without a ridiculous amount of effort? Anyone sell something that may help?

Cheers

Re: Carbon Frame and BBSHD

Posted: Jan 11, 2018 10:46 am
by fechter
They make a 100mm BBSHD for fat bikes. This could work with a spacer.

Re: Carbon Frame and BBSHD

Posted: Jan 12, 2018 3:57 am
by barbs00
Yes that might work but unfortunately I already have a standard size BBSHD motor I wanted to use.... :x

Are the small teeth/grooves of the BBSHD that bite into the bottom bracket likely to damage a carbon frame?

Someone told me it could crack the frame but the teeth seem so small that I can't see this happening? Then again I have been wrong before :D

Re: Carbon Frame and BBSHD

Posted: Jan 12, 2018 8:52 am
by Epyon
Any carbon frame with a threaded BB is going to have an aluminum insert, so no problem. A press-fit frame may not, but you'd have to use an adapter anyways.

Re: Carbon Frame and BBSHD

Posted: Jan 12, 2018 10:21 am
by SlowCo
Be careful as some carbon frames have a bottom bracket that is too thick in material for the BBSHD to fit. See this thread:
https://endless-sphere.com/forums/viewt ... &p=1127215

And the clearance of the BBSHD:
68mm-measurements.jpg
BBSHD clearance for BB.jpg
BBSHD clearance for BB.jpg (123.83 KiB) Viewed 137 times

Re: Carbon Frame and BBSHD

Posted: Jan 13, 2018 5:38 am
by barbs00
Very helpful! Thanks.

I didn't think of that but it makes sense as Carbon BB are thicker than Alloy