Friend of mine just bought a Luna X2 with the Bafang M600 motor and Rockshox suspension. It was on sale for $4,200, shipped quickly, and arrived within a week.
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Same angle direct comparison to my Hydra:
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As you can see, the Dengfu E10 frame geometry for the M600 build is slightly different than the M620 geometry. The downtube is at a shallower angle and the shock mounts to the downtube instead of the top tube. It looks like the seatpost position is moved slightly forward with a shorter top tube.
Some thoughts after a few short hours of comparison:
- The Sram GX Eagle 12 speed shifter they fitted to the X2 is really bad. It jammed twice when just trying to test out running through the gears. The upshift lever is also reversed from how Shimano does it which is an ergonomic nightmare... it's really hard to find a position on the handlebars where hitting that thing is easy. The actuation force was too high for shifting down to larger gears, and it just didn't feel very good. It came with a 38T chainring and 11-51T cassette.
- The Rockshox Yari fork and Deluxe Select+ shock seem okay, haven't ridden it on trails to see how they feel. The shock is much shorter on the X2 than on my Hydra.
- The KS branded dropper post isn't great, the lever is a weird shape, requires too much effort, and the travel is like half that of the Crankbrothers one on my Hydra. For some reason when adjusting the fixed position height, it started acting weird and slowly letting the seat down.
- I don't like the Sram hydraulic disc brakes. They don't bite very hard and one of the rotors arrived warped so that'll need to be fixed at a shop. The lever action feels good at least.
- The Bafang M600 is QUIET! Luna fits a custom PEEK gear into the M600 and you can literally barely hear it. Very jealous of that. This motor is the main reason I'd consider a bike like this.
- My friend ordered the stock motor controller instead of Luna's ludicrous controller, but the stock controller is okay. The torque sensor isn't as good/sensitive as the Hydra's and obviously it's not super powerful in comparison to the M620 with Archon X1. In my 500 watt assist level my bike felt faster than in max assist on the X2. I think it's tuned to class 3 from the factory.
- The wiring harness for the M600 has higher quality connectors than the M620 ones, and you can unplug the harness directly from the display. I wish Bafang would update this for the M620. The speed sensor has a connector in-line which makes replacement easy.
- General build quality is pretty good, there could be some cable management improvements up front. Paint quality is pretty good too.
- Luna's custom pedals are not very grippy (dangerously so) and I would immediately replace them if it were my bike.
- It came with a much cheaper WTB saddle than the Fizik one fitted to my Hydra.
- We weighed our bikes without the batteries and the Luna X2 was 6 pounds lighter. (The M620 is HEAVY)
- The battery case is identical, though its a 48V 17.5 AH battery as opposed to the 52V ~14 AH Hydra battery.
In general with a couple of changes (dropper, pedals, brakes, shifter, upgraded controller) I would really like the X2, I think Watt Wagons should definitely put together a Dengfu E10/Bafang M600 package as a cheaper option for people who would like less power, a quieter motor, and better customization options than Luna offers.