thunderstorm80
1 kW
- Joined
- Mar 29, 2016
- Messages
- 383
Hi,
One of the candidates for building an electric touring bike is the TDCM IGH direct drive motor.
It will be working together alone with a second front direct drive motor - H3525 or 9C+ 2707.
http://www.ebikes.ca/shop/ebike-parts/motors/igh-305.html
I have some questions and I would be happy if you can answer some of them:
1. They rate it as 500W-1000W, but my 9C+ 2706 is also rated for that range but it has a higher copper fill. Would you rate it as less powerful?
2. Does anyone have any experience with it, regarding gear shifting reliability and the motor in general?
3. What is the maximum and the minimum sprocket I can mount on it?
4. Can it be used in conjunction with a triple-crank and it's front-derailler? I ask because in regular rear-cassette you shift the gears not only for the ratio, but also to keep the chain on a strait line, which is a problem if you only have one sprocket - unless it's located in the "middle" of our replaced imaginary cassette?
5. The IGH hub weight alone is 2Kg which seems a lot to me, but I have no experience with IGH's. Is it the normal weight among these beasts? It seems I will gain around 1.4Kg just by replacing my derailler and the 8 speed cassette to this fellow, and lose some of the range ratio.
6. I was sniffing around ES, and discovered that the motor torque is transmitted through a single key on one of the axles. I couldn't understand better as there were no other pictures and explanations - but it seems like a highway to failure? Since the motor is the part that is laced to the wheel - if you lose that part, your pedaling effort will just like be in "neutral" gear, if I understood it correctly?
7. The rotor holes are of non-standard geometry. Is it easy to find a disc rotor for it?
8. With all my love to Grin, I heard there is also a slower wind version that they didn't choose to sell. Do you know where to buy it? Or maybe you have other knowledge of other DD's with IGH's you can recommend me? (ones with higher speed count than 5)
Thanks for any info
Roy
One of the candidates for building an electric touring bike is the TDCM IGH direct drive motor.
It will be working together alone with a second front direct drive motor - H3525 or 9C+ 2707.
http://www.ebikes.ca/shop/ebike-parts/motors/igh-305.html
I have some questions and I would be happy if you can answer some of them:
1. They rate it as 500W-1000W, but my 9C+ 2706 is also rated for that range but it has a higher copper fill. Would you rate it as less powerful?
2. Does anyone have any experience with it, regarding gear shifting reliability and the motor in general?
3. What is the maximum and the minimum sprocket I can mount on it?
4. Can it be used in conjunction with a triple-crank and it's front-derailler? I ask because in regular rear-cassette you shift the gears not only for the ratio, but also to keep the chain on a strait line, which is a problem if you only have one sprocket - unless it's located in the "middle" of our replaced imaginary cassette?
5. The IGH hub weight alone is 2Kg which seems a lot to me, but I have no experience with IGH's. Is it the normal weight among these beasts? It seems I will gain around 1.4Kg just by replacing my derailler and the 8 speed cassette to this fellow, and lose some of the range ratio.
6. I was sniffing around ES, and discovered that the motor torque is transmitted through a single key on one of the axles. I couldn't understand better as there were no other pictures and explanations - but it seems like a highway to failure? Since the motor is the part that is laced to the wheel - if you lose that part, your pedaling effort will just like be in "neutral" gear, if I understood it correctly?
7. The rotor holes are of non-standard geometry. Is it easy to find a disc rotor for it?
8. With all my love to Grin, I heard there is also a slower wind version that they didn't choose to sell. Do you know where to buy it? Or maybe you have other knowledge of other DD's with IGH's you can recommend me? (ones with higher speed count than 5)
Thanks for any info
Roy