Mid Drive kit for Old School spec BB

[ridingmn]

I would like to put a mid drive kit on a donor bike I have, but the bottom bracket diameter seems wider than most. The bottom bracket is Old School US specification (56.5 O.D. x 51.5 I.D. x 68mm Width) like the BBs on BMX and typical cruisers.
Is this a problem with most standard kits, if so are there other reasonably priced options. I would like to stick with a mid drive for the hill climbing ability, otherwise I know a hub motor is an option. Any help is much appreciated.

 

[ridingmn]

I asked Lunacycle a USA distributor of the Bafang mid drive and they could not tell me what size their kits fit ("it uses whatever is standard...it fits on most bikes. "). Does anyone here know the diameter the Bafang fits. Thanks

 

[tommie]

There you go http://www.szbaf.com/en/components/component/motor/mm-g01350dv.html

 

[ridingmn]

Thanks for the great info, but I didn't see the diameter of the bottom bracket listed, I saw the width listed. Perhaps I just missed it though.

 

[ferret]

Dimension D appears to be the BB width.

 

[ridingmn]

I agree, but I was also hoping to find the diameter of BB that it will fit.