A deep dive on the TQ-HPR50 eMTB motor and Harmonic Pin Ring Technology, debuting today on the all-new Trek Fuel EXe 140mm Trail Bike
. It is a 140mm eMTB with the $12,999.99 XTR-equipped 9.9 model weighing a claimed 17.47 kg in a size medium. It rocks a 360 Wh battery powering a mid-drive motor with a peak power of 300 Watts and a maximum torque of 50 Nm. Those stats align it with other lightweight mid-level assist eMTBs on the market such as the Orbea Rise and the Turbo Levo SL. However, unlike the aforementioned, the new Fuel EXe doesn’t even look like an eBike, at least not upon first glance of the drive-side, anyway.
The TQ-HPR50 delivers a peak power of 300 Watts and a maximum torque of 50Nm, as compared to the 500 Watts and 85Nm/90Nm torque offered by the full-powered eBike motors out there such as the Shimano EP8 and Bosch Performance Line CX.The TQ-HPR50 motor has one of the smallest footprints of any eBike motor on the market. It doesn’t seem quite as small as the Fazua Ride 50 Evation Motor, but like that one, the TQ-HPR50 is small enough to fit directly behind the chainring.
We hopped on a call with TQ Product Manager, Daniel Theil, to learn more about the TQ-HPR50 motor and how it differs to the higher power eMTB motors we’re all a little more familiar with. He has a background in mechanical engineering, and has been working on the TQ-HPR50 since the beginning. Here’s what we learned.
Because the TQ-HPR50 can achieve the required reduction ratio in one step, without the use of lots of moving parts, the whole motor can be constructed concentric to the bottom bracket. It’s neat, right?The reduction ratio of the TQ-HPR50 motor is 17.5, much lower than the reduction ratio used by other commercially available eMTB motors. On the Levo SL 1.1 motor, this is around 50. So on that bike, the electric motor spins 50 times as fast as the rider’s pedaling cadence.
The main battery on the new Trek Fuel EXe lightweight eMTB has a 360 Wh capacity; there is an optional 160 Wh Range Extender available.the battery, it will pedal much like a regular trail bike. That’s thanks to its drag-free internals and integrated freewheel. Of course, all eBike motors have that integrated freewheel that decouples the axle from the gearing, but in some cases there are still some parts moving inside the motor even when the system is switched off.
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