8fun/bafang comparability with vintage cruiser

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bryanmanuele
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8fun/bafang comparability with vintage cruiser

Post by bryanmanuele » Nov 22, 2017 9:35 am

Need advise? Wondering if the 8fun/bafang conversion kit would be compatible with a vintage cruiser (circa 1940s) single piece crank and bottom bracket?

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motomech
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Re: 8fun/bafang comparability with vintage cruiser

Post by motomech » Nov 22, 2017 9:53 am

It's not going to pedal very well. You would be much better off going with a hub motor.
Motomech

'03 Rocky Mountain Edge 2WD 260 Q100H frt and Ezee V1 rear 2 Elifebike 20A & 25A 9-FET controllers 12S/20Ah Multistar Lipo rear 5Ah Turnigy frt Luna Cyclops Extra lite Alex 24DM rims, 2.4 Holly Rollers run ghetto tubeless. 25 mph. Mean Well HLG-320H-48A
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'07 GT Idive 4 4.0, Q100C 201 12S LiPoly elifebike 9-FET 17A controller. 20 MPH.
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Rassy
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Re: 8fun/bafang comparability with vintage cruiser

Post by Rassy » Nov 22, 2017 11:09 am

I'm currently working with a friend that plans to replace his one piece crank with a BBS02. The main issue is that the bottom bracket shell diameter is much larger than the standard 3 piece crank shell that the BBS02 is sized for. There are standard adapters available, but they have the hole through the middle centered and that doesn't leave enough clearance for the BBS02 to slide in.

My friend plans to have a couple of fairly thick shouldered adapters made at a local machine shop with the correct size holes for the BBS02 drilled near the edge instead of centered. There are other potential solutions, search on "eccentric bottom bracket American to English".

It will probably be a while until I can report on the success of his project. He lives an hour and a half away, by car, and I will be taking my spare BBS02 over to him sometime next week so that he can get the measurements he needs for making the adapters.
-Rassy-
One Tadpole Trike equipped with a Bafang BBS02
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One Delta Trike equipped with a Bafang BBS02
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bryanmanuele
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Re: 8fun/bafang comparability with vintage cruiser

Post by bryanmanuele » Nov 23, 2017 9:36 am

Thanks for your feed back I can see the potential of the custom adapters, it may be very difficult here is the States as machine shops are pretty rare.

bryanmanuele
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Re: 8fun/bafang comparability with vintage cruiser

Post by bryanmanuele » Nov 23, 2017 9:42 am

motomech wrote:
Nov 22, 2017 9:53 am
It's not going to pedal very well. You would be much better off going with a hub motor.
Thanks your comment makes me understand that much of the speed of the system comes from gearing which of course is absent in the single speed cruiser.

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