Seeing if I can make a mid drive.

[J-sizzles]

Scored a free brushless motor from a lawnmower my neighbor was tossing because the battery wouldn't charge. Im attempting a mid drive with the option to go left drive if needed I'm not to sure about this freewheel crank I'm trying to build.

 

[Sidewinder Jerry]

Scored a free brushless motor from a lawnmower my neighbor was tossing because the battery wouldn't charge. Im attempting a mid drive with the option to go left drive if needed I'm not to sure about this freewheel crank I'm trying to build.

I'm sure the rubber/plastic components inside of that freewheel got destroyed during the welding phase.

 

[cloakedvillain]

What rpm does the motor run at full voltage?

 

[J-sizzles]

What rpm does the motor run at full voltage?

I believe 2800, so my chainrings would be spinning around 533 rpm with the gearing 9x48. I hooked it up to a eBay motor controller to make sure it worked before I started working on it and it is good on a throttle.

 

[J-sizzles]

Im thinking about three pieces of square tube welded to the plate the motor will be bolted to in a triangle. Im thinking , have the top two go horizontal just barely inside the seat tube and the down tube and the bottom tube go down at a angle. Maybe I could attach the to the frame with u bolts. I will probably end up doing as something else once I know exactly how far out I will need have the sprocket.

 

[J-sizzles]

I'm sure the rubber/plastic components inside of that freewheel got destroyed during the welding phase.

I cooked the lube out for sure, Im pretty sure there is just pawls a and ball bearings in it. I just did a bunch of tiny welds with about 10-15 minutes between them. It still freewheels and engages but I'm pretty nervous about how it will turn out.

 

[GW's Motorized]

Just order a pedal freewheel

 

[J-sizzles]

I'm too drunk to figure an ideal jackshaft situation. First thing is to figure the mounting of the motor to the

So the motor will drive the big chainring which is 48 tooth. The mall 24 tooth chainring will drive the rear. 48/9=5.33 2800/5.33=525 so at max speed the chainring will be 525 rpm and my rear cassette is a six speed 14x28 but I am planning on staying in the lower gears. So 24/28=.857 525*.857=449 449rpm at the wheel at max motor rpm. According to the Omni calculator a 26binch wheel going 449 rpm is 35 mph. I'm sure I screwed up something in my math.

 

[J-sizzles]

Just order a pedal freewheel

Do you know who sells one for a square taper?

 

[cloakedvillain]

I want to say l-faster but after a lot of searching I can no longer find it. This will come with one but it is a lot for just one part. https://www.cdhpower.com/new-shifter-kit-motorized-bike-jackshaft-kit.html

You could try to contact Pablo but I don't know if he still has access to machine tools. The biggest problem with the copy kits is the freewheel itself. The second biggest is the quality of the rest of the kit.

If you swap to an isis bottom bracket these will work. https://www.ebay.com/itm/2560277373...jmq7wgurws&var=&widget_ver=artemis&media=COPY

I know I am spamming but that second link is to pablo's ebay. He still has some new old stock.