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In reality, every electric motor delivers 100% of it's rated power at STALL."Just like traditional EVs, LiveWire can produce 100 percent of its rated torque the instant the throttle is called upon."
How can 100% of rated torque can be transferred to the rear wheel when you have chain drive powertrain?!!!
Some losses there...
Depending on the volume of electricity available, and the duration of that stall, any electric motor will also self destruct under those conditions.
As for power train losses. First, the chain drive is the most efficient power transfer strategy available.
Now, given a gear ratio of 1:1 once the slack is taken out of the chain, effectively there is no power loss at stall, and little at speed. Granted, you have to keep the chain well oiled to reap those results.
Drive shaft based strategies are the least efficient method of power transfer in bikes, and you'll notice that most of the bikes introduced with high performance as their salient purpose, still use chains