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.
Hey to answer your questions
Wheel size is 26 inch yeah
Front chain ring is 48t rear cassette is 28t-13t motor freewheel is 13t
Battery is 10 ah headway lifepo4
Without pedalling I'll see about 15 miles at 20-25mph
Highest speed I've seen with pedalling and a slight gradient was 66kph without pedalling and on flat terrain it'll do 55kph
The mount position is simply because that's what I was supplied with. The downtube mounts are for multi chainring kits.
The battery is located centrally due to its weight. A higher mounting position would cause handling issues. I had the battery mounted on a rear rack but found it had too much influence on the handling.
I am currently using the stock controller. It's working fine. I have a Lyon 12 fet but haven't fitted it yet.
Torque sensors don't interest me as I rarely pedal. Due to the high speed needs of the motor and my gearing I cannot keep up with it.
Acceleration is great. I use 1st and 2nd gear most of the time. In 2nd it'll go from a standstill to 40 kph in 7/8 seconds.
Hill climbing is superb. Pretty much any on-road hill your ever likely to encounter would be easy meat for this kit.
The planetary gearbox is noisy. Not crazy loud but passers by will know your electric. I have some gear oil mixed in with the grease and that quietened it down a bit.
For the speeds you mention 250w wont get you anywhere near where you want to be. To climb a slight hill at 40kph your gonna want 900-1200w kit.