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Road Bike Frames, Wheels & Components / Re: BXT SL-115
« on: April 19, 2026, 06:48:12 AM »TruckRun RN04 hub motor
Pros:
- Fits most thru-axle bikes.
- Can keep front derailleur and crankset, Q-factor.
- Torque sensor works okay. No 'ghost pedaling'. But I think the assist levels are based on speed limits where the motor cuts out, e.g. Lvl 1=25km/h, 2=30km/h, 3=35km/h, 4=40km/h, 5=45km/h, so they don't actually change the ratio of assist to your pedaling force.
Cons:
- Only 250W. Can only reach around 28 mph with a fair amount of pedaling power.
- A lot of drag without motor assist.
- I put on a 36V 10.5Ah battery so range is only 30-40 miles.
- You need to build the hub into a wheel rim.
- Has a Shimano HG 11/12 speed road freehub, so no SRAM XD/XDR or Micro Spline.
ToSeven DM02 500W mid-drive motor
Pros:
- Fairly powerful, and utilizes rear gearing. Can reach 28+ mph.
- I put on a 48V 20Ah battery so range is 70+ miles.
- The torque sensing works a bit better. You can change the ratio of assist.
Cons:
- Can only install on aluminum or steel bikes with a 'full tube' BSA bottom bracket shell and narrow chainstays for clearance from the motor gear.
- Q factor very wide at ~200mm plus I had to use a 16mm pedal extender on the left to even them out.
- Need to use special 1x chainrings made for the motor.
Overall I like the TruckRun RN04 better. You can put it on nicer bikes like a carbon road bike, and can keep your drivetrain and crankset with the same Q-factor. It also looks a bit more discrete than the ToSeven DM02 mid-drive. Actually I upgraded this bike with a carbon crankset and wheels to bring the weight down to 12.6 kg/27.8 lb with battery & motor.
Hi
You said that the motor drag is high. Is this true?
Thanks

