This looks like the key, don't have a micrometer. Can someone check?
http://www.grainger.com/Grainger/Machine-Key-5WU59?Pid=search
or this one:
http://www.grainger.com/Grainger/Machine-Key-5WU57?Pid=search
Looking for miscellaneous parts for some MAC geared hub motors including bearings, shaft keys (good ones!) and retaining rings.
Are these standard english or metric parts? can anyone identify a good place to buy? What sizes are they exactly?
Heat kills hub motors - especially my MAC geared hub motors. Why not ventilate a hub motor? Of course they are sealed to keep out the elements (read:water) but I think you could keep the inside of a vented motor dry enough.
In the mac motor, ventilation might best be done on the freewheel...
As many people have noted, here in Pennsylvania we’re trying to get our
legislature to amend the motor vehicle code to include a classification
for electric assist bikes based on the Federal code. The current code
really doesn’t distinguish between electric assist bikes and
motorcycles!
We...