Mid frame electric engines, Bosch and Bafang

A litte about Bosch and Bafang solutions:

Fine Crescent electrically assistent (Bosch Motor), crankset, 10 gears
The advantage of this type of mid frame bicycle is that it has no hub motor and that it rolls better than a bicycle with an electric motor in the hub. Significantly better roll down the slopes and feeling more like a bike.

Price about ca 23000 swedish crones. Weight: 21.5 kg. Picture from Cresent.se

This bike was a testwinner in a review that a Swedish Newpaper did. You can watch the test here, only in swedish.

ENGINE
Bosch 250 W Operating on crankset

BATTERY
Bosch Litiumjon 36V, 8,8 Ampere



Dismantling of av Bosch electric engine:



6500 kilometers and problem.. hmm. Bad quallity?



Other option Bafang:

48 volt Bafang BBS02 750W mid drive, Bild från http://www.electricbike.com/mid-drive-kits/

Read more here: http://www.electricbike.com/bafang-bbso2-750w-mid-drive/


Some modells can be bought at Aliexpress

Bilden från: http://www.aliexpress.com/item/36v-500w-8fun-bafang-bafun-motor-BBS-01-mid-Center-drive-position-Motor-eletric-bicycles-trike/1462773228.html

Here is a video showing gear changes.