For over 4 years now I have been using a rear hub motor. Recently I bought and installed a Tongsheng crank drive motor and have been riding it now for about a week. I have found it interesting as well as challenging and somewhat disappointing making the switch from hub drive to crank drive.
First of all, I NEED MOTOR ASSIST. My knee joints are not capable of doing the job all under human power. Riding under my own power I ride along at about 2 to 3 mph. Walkers pass me. It is embarrassing! I ride in pain and it is misery … not fun.
I had both knee joints replaced a few years ago as both were bone on bone and I was in misery. With new man made knee joints “installed” I am doing better but I still suffer much knee joint discomfort. With motor assist I can and do ride much faster and it makes the riding fun again. I am still getting plenty of exercise but it is fun again. I can’t turn back the clock. I don’t have a time machine to step into. Having motor assist is the next best thing. I enjoy my daily rides. Oh, I am still in some pain, but I am not in misery like I am riding without a motor to assist me.
A few weeks ago my hub motor system developed a problem. The electrical power keeps shutting off and restarting when ever I try to use the motor. I have tried unsuccessfully to find the cause. I have sought help from others including the company I bought it from … all without success. I don’t have the component parts just sitting on a shelf to try hoping it would fix the problem. They are expensive to buy and a bit risky as far as whether or not replacing that particular part would fix the problem. So rather than gamble on whether on not buying an expensive part would fix it I decided to just buy another motor. Yes, it costs more than the parts would have but I wanted true pedal assist … something I don’t have with my hub motor as it is not “built into” the hub motor like some brands offer. All I have ever had with this hub motor is a manual thumb throttle to use.
I have had my eye upon the Tongsheng crank drive motor system for awhile now so it was what I bought. So now after using it for about a week here is the good, the bad and the ugly concerning it. As e-motor kits go it is one of the lowest in cost. That’s good … that’s very good! The pedal assist works great and I am really enjoying having it. The motor is not nearly powerful enough. I left my hub motor installed as I have found that I can use it with the power level turned down to about 40 % or less. It usually stays on with the lower power setting. Going from a 30/42/52 triple chainring set to a single 42 tooth chainring has been lousy. I lost my gear range. No more granny gear for when I truly need it and a much lower top speed as I spin out at 15 mph instead of 22 mph. I hate that! One thing I really do like about this new motor is the economy … how long the battery charge lasts compared to the hub motors I have had. Another good thing about the Tongsheng motor is that it is super quiet. The speedometer/odometer/tripometer is not accurate. Tongsheng does not provide the ability to enter the tire circumference number during setup. All that is offered is choosing tire size … 16,20, 24, 26, 700. Selecting 20 inch is apparently based on a 1.5″ width. If you use a smaller or larger tire the accuracy is off. I don’t like this. It probably would not bother some people but I like having accuracy in my computer.
I switched my hub motor controls over to the right hand side so I could have my Tongsheng controls mounted on the left hand side. Anyway, now I have thumb throttles on both sides and I can use both motors at the same time which is really nice when climbing a hill or going across a busy street. Even with both motors it is no rocket in speed or power.
I have my disappointments with this Tongsheng motor but overall I reckon I am glad I bought it. Would I do it all over again? No, probably not. I think I would buy the Bafang with torque sensing. I did not know about the Bafang with torque sensing when I bought this Tongsheng. It is said to be considerably more powerful than the Tongsheng. As a teenager and young man I had a few high performance cars including a 327 c.i. 365 hp Corvette, 383 Plymouth police interceptor with dual 4 bll. carbs and 426 555 hp Hemi Dodge Charger R/T so I got used to having power to use. This Tongsheng is like driving an American Motors Rambler or maybe a Yugo. I am sure that is quite sufficient for some folks. I will survive, I reckon. Certainly it is helping me to …
KEEP ON TRIKIN’
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Hey, speaking of Yugos … did you hear about the man who walked up to the parts counter at a car parts store and said to the employee behind the counter … “I’d like a rear view mirror for my Yugo”. The store employee was silent for a few seconds and then replied back … “You just might be able to make a deal like that”.
I ordered a Tongsheng TSDZ2 crank drive motor March 25, 2021 and installed it in very late April after waiting to get an extension cable I discovered I needed. Yesterday with only 1365 miles on it I uninstalled it as it no longer ran. It didn’t even last two months. I am very disappointed with it and there is no way I can recommend it to anyone. It is a piece of junk as far as I am concerned. I have requested a full refund. I will be waiting to see how that goes. It was my first experience with crank drive as I have always had a rear hub motor since I got into e-motor assist over 4 years ago. I did discover that I don’t like crank drive at all. It is very hard on the drive train. A hub drive is much more practical. I think the Tongsheng motor is underbuilt and poor quality.
Tadpole Rider 