Bottom Bracket Standards and Bafang mid drive motors

[opperpanter]

I have my eye on a corratec full suspension mtb from 2016. The seller tells me it has a "Shimano sm-bb51” bottom bracket. I can't tell if that's something that exists, but it like a 68/73mm bottom bracket with external bearings. Any idea how this maps to the brackets mentioned above in first post?

https://www.mec.ca/en/product/5037-318/Deore-SM-BB51-Hollowtech-II-Bottom-Bracket-68-73mm

This link even mentions it's a 68/73 BSA bottom bracket, which gives me high hopes.

https://www.amazon.co.uk/Shimano-SM-BB51-Hollowtech-Bottom-Bracket/dp/B003UW7MWE

 

[amberwolf]

The seller tells me it has a "Shimano sm-bb51” bottom bracket. I can't tell if that's something that exists,

easy to check if it exists, using just the stuff in your quote marks:
https://www.google.com/search?q=%22Shimano+sm-bb51%E2%80%9D

Any idea how this maps to the brackets mentioned above in first post?

since various pages in the above search results say in one way or another that it is "For 68/73mm English threaded bottom bracket shells ", that means the bb of the bike frame it is in will fit anything else that is like that.

it doesn't say exactly what the bb width is, of course, but it is between 68 and 73mm, or this unit wouldn't fit it.

 

[glovemtb77]

Thanks for great tech specs !!!
I know you get allot of these emails but I am hoping you have the time to answer this one.
This is in reference to your wonderful post that helped me so much with learning bafang e-bike conversion kits and refreshed my knowledge on pf bottom brackets. (I have built many a bike for 30 years but it has been awhile.)
Here is the bike I am putting a bafang bbshd or prefereably a bbs02b (I might be able to get one of those.)
https://www.bike24.com/p2213518.html
zooming with the mouse will pretty much show most of the story. Here is the rest: 73mm bsa threaded boost 148 rear. To clear chainstays they say you need a boost length crank and can only do 32t on a 1x setup. On this "NS Eccentric Cromo" model frame. (not eccentric bb) I know I have to grind down one of the isg tabs.
https://www.ecosia.org/images?q=NS+Bikes+Eccentric+Cromo+29%2B%22+Frame+2019+images
https://www.nsbikes.com/eccentric-cromo-29,122,pl.html
I think below is your bike:
https://www.specializedconceptstore.co.uk/product/2426/2016-fuse-expert-6fattie/
After I researched you great red fuse e-bike it seems to be a fatty frame with 148mm truaxle and supports a 30T, 76mm BCD spider.
Now I know the bbs02b is good for 68/78mm. But never said anything about boost chain-line on this old model motor.
But, going by what you were able to do I think the bbs02b you used must have a shaft of around 76mm or longer. So this leads me to believe I can use it on my NS frame like you did on the fattie; and don't have to go to a 100mm(fat) bbshd model, to get my chainline about right. What do you think ? Am I on the money with this logic ? How was the Q factor on the cranks arms ? Were they fairly centered ?
Thanks again for your great write up !

 

[Tommy L]

Excellent read here!!!

I was either going to Bafang rear geared hub/maybe 2wd.......
Or do my first fat BBSHD

I just purchased the Framed Alaskan.

100mm BB30..... and started my research and found this most excellent post.

I’m trying to figure this out. My BB30 is a
Raceface xType.

Shell Width: 100 mm
Frame Interface: English
Crank Compatibility: FSA MegaEXO, Shimano Hollowtech II, RaceFace EXI

There are so many adapters out there.....
If I do the BBSHD 100mm, what’s the strongest type adapter?

I found this ..... but out of stock .....
Is this what I need??? Is it strong???

https://www.modernbike.com/race-face-30mm-bb-cup-set-bsa-100mm

Thank you

Tommy L Sends......

 

[Xenom]

I'm missing information regarding sram gxp pf92

 

[Coach v]

I am looking at buying a used 2013 Salsa Beargrease for a bbshd conversion. According to Salsa's specs, the 2013 BB is 100mm English. This should work for with a 100mm bbshd kit correct?

https://salsacycles.com/bikes/archive/2013_beargrease

 

[jangles]

It will if it's really 100mm . I say that because I bought a bike that the specs said was 100mm and it ended up being 115 mm . I cut it down and made it work but was a little miffed . I'd have it manually measured before I bought a motor . You can always go to 120mm if needed .

 

[opperpanter]

Any experience with this adapter kit? Would allow for installating a BBS02 68/73mm on a BB92 bike. I am about to buy a Giant Anthem. The specs says Praxis BB90 PressFit, but I think I've seen people using the BB90 shell adapters on them with a BBSHD 100mm. So would think this lekkie adapter would fit with a BBS02? I have 2 BBS02 laying around so would save me a bunch of $$$$ for the HD.

https://converted.co.nz/product/lekkie-bb86-92-bafang-adapter/

 

[geosped]

Anyone know for sure if a 29er with ISIS GigaPipe which I believe is 68-73mm bb will work with the BBSHD kit? I want to transfer my existing BBSHD which was for 68-73mm from a 26" bike to a 29er.

Specifications on the Bottom Brakcet:
Frame Interface: BSA/English Threaded
Spindle Interface: ISIS
Bottom Bracket Shell ID: 1.37
Shell Width: 68mm (108mm), 68mm/73mm (113mm) I need to make sure which version this bike has I cant find any details.

Here are the specs on the bike: https://www.bicyclebluebook.com/value-guide/product/11953/

Also will be putting a small battery under the seat. I currently have a triangle pack and it wont fit so going to do with a smaller pack.

 

[tomjasz]

Google is your support. “Gary Fisher Sugar bbshd”