schwibsi wrote:Hey, this is very interesting.
I am also planning on using the 1200W kit. A few questions, if I may.
What size, wheels do you have? (I'm guessing 26")
What gearing to you have in front and back?
How many teeth do your freewheels and chainwheels have?
How many AH does your battery have?
How much range do you get?
What's your topspeed? (with, without pedaling)
Why did you mount the motor below the crank and not between the bottom tube and the saddle tube?
Did you ever consider mounting the battery to the top tube of the bike?
Do you use the stock controller? Know of any better options?
Have you ever thought about implementing a torque sensor?
How's the acceleration and the climbing ability?
Is it noisier than other motors?
I'm wondering a lot about the efficiency at lower rpm and power levels.
For the most part I will not need more than a continuous 250W and I'm wondering if I'm going to be using a lot of range as opposed to a 500W or 650W kit. I'm not interested in using it as a motor bike, but I will always add to the power. In stead of 28-30kph on the straight I want to be able to do 40kph with the same effort and not slow down on slight slopes.... Oh and also, there are some short but pretty steep hills hat I have to climb with the bike.
Do your chain and freewheel handle good the power ? Or do you have transmission problem ?
As a last experiment I have gotten 3 chains with this last set and I intend to try a wax/ptfe bath lube setup. The idea is new sprockets all round and 3 new chains. First degrease the chains and relube them in the hot wax bath fit the first chain and run for a "to-be-determined" amount of time, maybe a week or two. Then fit the second waxed chain and rewax the first. Then remove the second chain fit the third and rewax the second and so on. The theory is that sprocket wear is due to chain stretch. If I can spread the wear over 3 chain worth of stretch I can get a set of sprockets to last the 3 chains which is about 6000km.
Now as I said this is an experiment I'm not sure how this is going to pan out but it's worth a try. I can change a chain almost as quick as the time it takes to lube a chain so there is not much extra work in it.
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