There is no doubt about it. Torque sensing is best and preferable over PAS (pedal assist sensor)(cadence sensing). That being said, not all e-motor system kits have torque sensing as part of their offering. I wish this were not so but alas it is what it is. My current e-motor came with both a hand throttle and a PAS sensor. I hooked up the hand throttle but I never messed with the PAS sensor. Just now I got it out of the box looking at it to see what would be involved in installing it. Of course, winter weather is upon us now so I don’t know if I will be messing with it before Spring when it warms up. I do need to get it installed for sure so that I will have “pedal assist”.


I paid big bucks for a torque sensor years ago.I had to buy a new crankset as the one from Catrike would not work with the torque sensor. I paid big bucks to install it. It didn’t work. A few months later I was having my trike worked on so I cautioned the mechanic that he needed to be very careful not to allow the torque sensor spindle in the bottom bracket to rotate as it has very delicate wires which will readily break.

He didn’t listen to me and he broke every one of the wires. It didn’t work before so it would not have mattered but I was getting ready to return it for a different type. I was very concerned about all the broken wires so my late brother in law who was a senior electronics technician repaired all of them for me. He did an excellent job on it but, of course, it was all for nothing since it didn’t work. Anyway, I got the other bottom bracket torque sensor but never installed it.  It would have required me to purchase another crankset as the one I had bought for the first torque sensor would not work with the newest torque sensor. And the local bike shop could not locate a crankset that would work so I never installed it. Now I don’t have that e-motor installed anymore so it doesn’t look like I will ever use the new torque sensor. I don’t think much of that type of sensor. They are just too delicate and too difficult to install and set up properly. Now they have a different type which is not mounted in the bottom bracket. I like that concept much better.

Here is a DIY hack some might want to consider.



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One thing I have noticed since I started using my current hub motor which presently is hand throttle only is that when applying electrical power to the motor it seems to store energy somehow and my trike when I let off the hand throttle will and can coast faster and longer than if I were simply pedaling under human power only. It is considerably noticeable. I am not sure what the term is for this. I titled this post Inertia or Stored Energy but neither one may be correct.


I have a new (never installed) torque sensor for the bottom bracket (crankset). I bought one when I bought my e-motor conversion kit from Grin Technologies. It required a different crankset than what came on my Catrike so I spent good money to buy one. With my assistance and guidance my LBS installed the torque sensor with this new crankset but the unit was faulty and never worked. Grin Technologies told me that this particular torque sensor has been very troublesome and many have not worked.  Of course, they didn’t tell me this until after I bought it and spent all this extra money to install it. It was a lot of wasted money. Grin Technologies had me send it back to them and they sent me a different torque sensor and, of course, it required yet another crankset. Consequently I never installed this 2nd torque sensor as I just didn’t/haven’t had the money to go thru all of this again. I am considering it now however. I would really like to have true pedal assist and not just a hand throttle. Some hub motors have a torque sensor built into them and are located inside the hub motor. Unfortunately mine does not. I don’t like anything about this “after market” approach as I call it. It is a very poor way to accomplish this. The unit is difficult to install and it is very easily damaged as it has extremely tiny wires which break very easily. That is my story and I am stuck with it as well as sticking to it. I spent the money for a torque sensor initially as I wanted a system that “felt natural” when pedaling. That is still my goal. I need to take the torque sensor into my LBS so they can figure out what is needed in the way of a crankset, discover one and get it ordered. As many of you know having a hand throttle only presents a problem sometimes as it violates some trail rules. Personally I think it is ridiculous but it is the way it is. Remedying this situation will help ensure that I can …


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