A closer look at the TQ-HPR50 eBike Motor & Harmonic Pin Ring Transmission
1.1 motor has a Q-Factor of 181mm. Trek spec E*thirteen E*spec cranks across all models for now, so the bike’s Q-Factor is only millimeters narrower than that of the Trek Rail. However, as and when narrower Q-Factor cranks become available, Trek will be free to run a much narrower Q-Factor than most other eBikes, making for a bike that, again, will feel more natural to pedal.
No other eBike motor runs the Harmonic Pin Ring System built into the TQ-HPR50 motor; it is a technology patented by TQ. Product Manager, Daniel Theil, gave us a more in-depth explanation of the Harmonic Ping Ring Transmissionreduction ratio Most other eBike motors on the market use planetary cogs to achieve the desired reduction ratio. They use several steps of cogs that engage with one another to reach it. Meanwhile, the Harmonic Ping Ring requires just one step, and that is executed by the how an inner spline ring interfaces with and drives an outer spline ring.
On most other eBike motors, the stator and other components are positioned offset from the bottom bracket, giving them that classic oval shape. On the TQ-HPR50, these parts sit concentric to the bike’s bottom bracket allowing for a nested motor construction.
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