'lightest.bike' 1.7kg 1000w mid drive

[neptronix]

Update from here. Been too busy with business until now.

The gears have been waiting for a cleaning since i drilled the unit out and ended up with a ton of shavings on the gears.
If i could do it again, i'd put a wet napkin in front of the gears. but you live, you learn!



I wanted to avoid disassembling the entire unit and ending up with less than perfect factory perfect fit, so i kept the gear stack in.

1 hour of manual labor, 5 ear swabs doused in isopropyl alcohol and a super tiny but long screw driver later..
I have the gears free of all debris particles that can be seen with the naked eye, and no visible binding or added friction in the gears. Had to scoop up some extra lube off the sides and throw it on the gears afterwards.

Close enough for government work!



I threw some extra solder on to make sure these wires aren't going anywhere..



and then i ghetto rigged a way to tension the wires together so that as the bike is shaking, the wire insulation isn't getting beat up and eventually shorting.



Will give it a spin on the VESC and report back in some days from now.

 

[neptronix]

Latest update from the indiegogo:



Looks like they are still having problems getting product out of the door.

I'll see how mine goes at 25A batt, 26A phase ( x 52v = ~1300W ) in sensorless mode and base whether to buy another unit as a backup ( assuming i won't get it in a realistic timeframe ).

 

[rhauff]

and then i ghetto rigged a way to tension the wires together so that as the bike is shaking, the wire insulation isn't getting beat up and eventually shorting.

View attachment 370639

Looks like you need a P-clip right there..

Nice work, looking forward to the results! Still haven't received mine.

 

[SCBiker]

Newbie here, thanks for all the prior experience with this kit. I ordered my kit about 2 years ago and recently received it and finally got the first short ride in the woods today. This is my first ebike kit install, but I'm generally comfortable wrenching on bikes. A few thoughts/experience in case it helps anyone else.

I used the pressfit adapter which caused me the most issues as the loctite product fully grabbed before the insert was in place and I couldn't move it - ended up cutting it out and ordering a second through a more local bike shop (I'm in the US). For the second one, I waited to apply the loctite until the insert was almost in place, no issues.

The standard mount (originally recommended since my bike has a straight downtime) was not close to working with a 36 tooth chainring. The medium mount (I actually ordered the hybrid mount, but only used the medium mount from it) works, but not overly generous clearance from the chain to the top of the chainring.. but no problems on the short ride today.

I ordered the custom shaft for the BB.. no issues, good length, no noticeable wobble. You do not need any of the spacers for use with the custom shaft, but they are still in the install kit.

I have the 700Wh battery.. I wished that I would have gone smaller currently. The 700 (or actually 720) is too large for in my bike frame, so I have it on a rear rack. I extended the cable with 12ga, silicone covered wire to XT60 connectors.

First ride was muddy and slippery. The motor takes a pedal stroke to respond and surged some on me (on and off), so I have tuning to try to improve that. I have the 750W motor, superhero kit. Plenty of power for me as I wanted something for when I'm taking tools into the woods to work on the trails. The 36 tooth chainring is a limitation for top speed that will likely bother me down the road. Have connected the app through an old android phone - a somewhat newer android phone did not work with the app.

 

[neptronix]

Howdy.
You should try a medium mount or hybrid mount, on most bikes, this will give you the ability to run a 42T or larger.
You'd be the first person to mention no wobble in the cranks, i think. Wondering if they finally fixed it.

Best place ( for weight balance and handling ) to mount a battery that doesn't fit in the triangle is on the top tube and forward. Look into a grin technology bottle bob for a ready to go mounting solution.

Curious to see if you can get the torque sensing tuned to work right. Or if it remains pulse-y no matter what.

 

[SCBiker]

Thanks - I hadn't seen that offering from Grin technology before. I'm not anxious to give away my standover clearance, but will keep that one on the table as I look for options.

I hadn't seen any other notes (maybe missed them) on any one else trying the custom BB spindle? But maybe the machining for that or the supplier is different from the standard offering which has the wobble?

I have the medium mount currently installed (tried the standard mount initially, but it was a no go). I may try the hybrid if I encounter any chain slap hitting the chainring.

Yeah, don't have a game plan on tuning the torque sensing yet.. I think mud and slippery roots yesterday wasn't helping, but will share if I find any improvements that work for me.

 

[neptronix]

I would recommend it towards the front of the bike if you still need standover clearance.
There exist shun 170mm cranks you could use on this motor to reduce the standover problem ( now, seat can go down 5mm )

The wobble was in the cranks, not the bb thankfully. Haven't heard of a custom BB spindle experience on here.

You have the medium mount but can only fit a 36T? that's strange, can you post a picture of the bike with motor attached?

 

[SCBiker]

Here's a pic, 2 up from the highest gear.

 

[neptronix]

Dang.. this bike has an unfortunate shape.. i think you might get to 40T with the hybrid mount if you are lucky.
The dual chainring mode would be the way to go if you need substantially better than that.