quote5405 Ride Report:
Had a 14 miler yesterday on my Bomber shod with the 5405 18MC rim running the 2.75x18 SR241. About 8 miles of that ride was in soft not too deep sand. Really soft stuff though. First the negative. Running 80V @ 70Ah, the 5405 isn't any faster than the 5404 off the line. Doesn't pull me any faster up hills, or in the sand. Top speed is 6MPH less than the 5404. With the dynamics of hub motors, I am starting to wonder if the laws of diminishing returns applies to any direct drive hub motor with more than 4 turn wire wind on the stator? Even on Justin's Ebike.ca simulator, the 5305 doesn't pull any harder than the 5304, the 5304 uses more energy doing it and runs about 5-6MPH faster with same input values. Even though the data is with the 53xx, the simulations reflect my real world findings as far as the difference between the 5404 and 5405 go for top speed and perceived thrust force. If this is the case, I can see why the Cromotor is only offered in a 4 turn stator. Now the positive. After my 14 miler yesterday, I noted that I had averaged 77Wh per mile. In comparison, back in September, when I first moved to my current location, I rode really close to the exact same ride as yesterday and my 5404 was about 83wh per mile. So the 5405 is getting the job done with less current at the price of slower top speed and as an added benefit, my voltage doesn't sag as much as it did hot off the charger which probably extended my battery life span by 50-75 cycles :lol: Being that top speed isn't as important to me as hill climbing ability, I was aware that the 5405 would be slower and not surprisingly, with corrected mm, still runs close to 39MPH WOT down the road. But if I had a chose between two motors, one motor went faster than the other, but they both had the same rated thrust torque force, I would take faster option, which is what the 5404 is compared to the 5405. A while back, I posted a ride report on the difference between the 5404 and 5403 when I first did that mod, there was a noticeable difference between the 5404 and 5403 off the line. What's really strange is with the wheel off the ground, the 5405 WOT spins 73MPH, my 5403 is good for 76MPH, the 5404 tops out at 65MPH. Not sure whats going on with that, but the wheel on the ground top speed of the 5405 is where it should be. In my opinion as things are the way they are right now, I would not recommend the 5405 over the 5404, and for bigger heavier riders and people that desire hill climbing over top speed, the 5404 is still the best of both worlds. All that being said, I reached out to some much smarter guys than me on the thread and learned that this may be a controller issue for why the 5405 isn't pulling harder than the 5404. One of the guys has responded to me and offered to walk me through modding my controller to get more out of the 5405. If I stay with the current controller, I will be doing this.
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