Buzzard
🧲 New user
Hello everyone. This is my first post to ES (amazing site BTW) I Have been reading and working on bikes for a little over a year.
I have a few successful hub conversions under my belt, but with this project I want something different. I wanted to do a mid-drive, so I could utilize my bikes gears, have a greater efficiency, and have something that will really hold up to offroading. Hopefully on a mountain bike.
This bike system is a work in progress at the moment, so the first few posts will just be catching up, sorry for the lack of pictures.
I started acquiring parts for this build a couple months ago, slowly but surely, the first thing I got was the motor, model MY1016 Z3 rated for 24 volts and "1000 watts" but according to the sticker the rated current is 14 amps, which works out to 336 watts. This motor also seems to be about the same size as the my1016 250 watt rated motor, with an added gearbox. So I am skeptical of this 1000 watt rating. anyway its rated for 2950 rpm and has a reduction of 9.78:1. I'm just going to round numbers and say that works out to give or take 300 RPM.
My plan was to do a mid-drive with this mounted to the seat tube, with a chain connected to a crankset on the left side. But this motor ended up being just too wide to fit between the cranks, so I would have to have put it in an awkward position high on the seat tube, or on the bottom tube towards the front of the inner triangle. Also I would have had to find a way to clamp/mount it in place, and this motor does not have good mounting points other than the ones on the side with the sprocket. So I ended up buying a bracket to mount the motor to the rear triangle. But I was having chain alignment issues trying to do the mid drive, the bottom of the chain would rub on the bottom tube of the rear triangle. I tried different chain tensioners to hold the chain away from the frame and I was able to get it to work without rubbing, but no matter how I tried the chain wouldn't align very neatly/straight, always a degree of cross chain, and the chain would be either extremely tight or rubbing the frame.
The bike did work though, I had only put a 250 watt controller on because I happened to have a couple laying around. But it would turn the pedals with incredible force. I never took it very far because I didn't think it would hold up, and was worried the chain tensioner would go into my spokes. Also I have never used a mid drive bike before this and this felt extremely strange, there was no freewheeling chainring/cranks, and the motor was controlled by throttle, might feel more natural if it was pedal assist. And since there was no freewheel between the motor and cranks, it was almost impossible to pedal without throttling due to the Resistance of the motor.
Sorry for the long rambling post.. and We are still not up to date yet, but this history lesson will resume in the next post.
I have a few successful hub conversions under my belt, but with this project I want something different. I wanted to do a mid-drive, so I could utilize my bikes gears, have a greater efficiency, and have something that will really hold up to offroading. Hopefully on a mountain bike.
This bike system is a work in progress at the moment, so the first few posts will just be catching up, sorry for the lack of pictures.
I started acquiring parts for this build a couple months ago, slowly but surely, the first thing I got was the motor, model MY1016 Z3 rated for 24 volts and "1000 watts" but according to the sticker the rated current is 14 amps, which works out to 336 watts. This motor also seems to be about the same size as the my1016 250 watt rated motor, with an added gearbox. So I am skeptical of this 1000 watt rating. anyway its rated for 2950 rpm and has a reduction of 9.78:1. I'm just going to round numbers and say that works out to give or take 300 RPM.
My plan was to do a mid-drive with this mounted to the seat tube, with a chain connected to a crankset on the left side. But this motor ended up being just too wide to fit between the cranks, so I would have to have put it in an awkward position high on the seat tube, or on the bottom tube towards the front of the inner triangle. Also I would have had to find a way to clamp/mount it in place, and this motor does not have good mounting points other than the ones on the side with the sprocket. So I ended up buying a bracket to mount the motor to the rear triangle. But I was having chain alignment issues trying to do the mid drive, the bottom of the chain would rub on the bottom tube of the rear triangle. I tried different chain tensioners to hold the chain away from the frame and I was able to get it to work without rubbing, but no matter how I tried the chain wouldn't align very neatly/straight, always a degree of cross chain, and the chain would be either extremely tight or rubbing the frame.
The bike did work though, I had only put a 250 watt controller on because I happened to have a couple laying around. But it would turn the pedals with incredible force. I never took it very far because I didn't think it would hold up, and was worried the chain tensioner would go into my spokes. Also I have never used a mid drive bike before this and this felt extremely strange, there was no freewheeling chainring/cranks, and the motor was controlled by throttle, might feel more natural if it was pedal assist. And since there was no freewheel between the motor and cranks, it was almost impossible to pedal without throttling due to the Resistance of the motor.
Sorry for the long rambling post.. and We are still not up to date yet, but this history lesson will resume in the next post.
