BaFang mid drive electric motor

There have been some new developments in the E-bike world. Those would be the move away from the hub powered motor to what is called a mid drive motor. Hub motors are like ceiling fan motors mostly direct drive with some being geared and able to freewheel.

 This category is the best selling and easiest way to motorize a bicycle electrically.... However, many off roaders are using motors sourced from the radio control world and mounting them upon the bottom brackets of the common bicycle which presents some problems for the designer... One of the problems is that these RC motors are very high RPM and there needs to be a gear reduction of sorts so that their power can be effectively used by the bicyclist as a power assist....I will link to some interesting articles...


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


The new BaFang motor system designed to fit most bicycles for power assist... This is the motor that I am seriously looking at to build up my second power assist bicycle. There is a freewheel mechanism in the crank itself that allows use of the throttle without pedaling.

A  video is worth a thousand words....


http://www.youtube.com/watch?v=jqsMRjOev3k


flying on a fat bike or on a 2 niner off road about says it all for this new system....

Rebuilt drivetrain on Fisher CR-7

I just rebuilt the drive train on this '89 Fisher CR-7 and the drive train was original from that year and I had ten's of thousands of miles on these chainrings with multiple replaced chains but the crank and chainrings and cassette were original..... New Sugino 8sp crank....130 dollars New 8sp chain...........12.00 dollars New 8sp cassette .......55.00 dollars Shout out to Yellow Jersey bikes of Madison WI and Back yard Bikes of LaGrange WI....for the hard to find old parts.... I am running a road cassette with 11/28 since I am running a power assist bike... What is interesting about the GEBE/Fisher build is that it's at its most efficient at 22 mph average speeds and with a modest pedal assist mainly on hills and start up and one can pedal near all the time for wonderful fuel economy and a bit of a workout if ya want one..... 250 miles plus per gallon if using a strong pedal assist or about 215 to 220 if pedaling only moderately and of course one can get an absolute killer workout if one unhooks the motor and just rides it like a real pedal bike....say like on the Glacial Drumlin trail.... Well I am well over 16000 miles upon this system and looking at the new world of the pure electrics with the new mid drive motors and much improved batteries....