LMX 64 : Freeride Ebike with dual drive and torque sensor

Yeah, that noise reduction is awesome! Can barely hear it over the free-wheel. Maybe I will get a Hope cassette to really drown out what little noise remains. :lol:

Also awesome news on the colour option. Now I need to choose which colour. :?

With all of these little improvements and options still being worked on, will you be reaching out/contacting those of us with pre-orders to finalise options before delivery?

Cheers
 
bzhwindtalker said:
The frame kit includes the Nucular controller and display, sempu 3th gen torque sensor with crank arms, no BMS is provided unless you take the battery with the kit.
Click to expand...
May i ask which make of crank arms you're using? I tend to buy some Sempu BB (maybe v2.3) and the only taper square with replaceable chain rings i could find was a cheap sram truvativ set.
Are you not worried that the taper square may wear out fast under harsh conditions?
Thanks!
 
Yes we use square taped sempu 4.3 sensor. They do not carry/produce the ISIS type. We also buy the crank arms from them, they are forged. I asked for strength and cycling load test report for those cranks, but they only had it for another crank style from the same manufacturer, with same process and materials.

Bafang also has a 100mm torque sensor, but it is also square taper and the assembly is heavier and bearing installation and size is not as good as the sempu. It also requires higher voltage to operate.

So far we found no other supplier of 100mm BSA torque sensors.

I think as long as the axle and cranks are good quality and well supported by the bearings (unlinke the GNG kits back then with long spindles and 68mm BB) it will hold up just fine. We tested with some agressive riders, moderate jumps. End of the month we have a video shoot coming with very good a slope style and enduro rider, the occasion for more testing before serial production begins.

Anyway we now have 9 month of testing on two bikes equipped with those sensors and zero issues. IF you are really concerned by strength for extreme offroad use, then removing the torque sensor and using throttle only with a regular 100mm BSA fat bike crank set from any brand you like is also possible.

Btw, the custom 6061 tubes are ready for all bikes. We will also receive the new motors samples early next week.

Adam
 
Thanks Adam. That's good news. Just to make clear: I'm no future customer. I want to install a Sempu sensor in my own bike. I hope you don't mind posting in your thread.
Could you do me one more favor please: What is the BCD of the chain rings? Is it "standard" 104mm?
Good luck with your great new product, it looks excellent, and i know how long the way from a prototype to a sales ready product is!!
 
bzhwindtalker said:
As requested, we made some video of trail riding without pedalling. Rider is Tom, one of the interns (motorcycle assembly and maintenance) at LMX. He has been with us since August and will stay 3 years total.
Click to expand...

Thanks for the video ... this looks great in my opinion. Very tempting to order. I love the look of black and orange. Great work guys.
 
mxs said:
Thanks for the video ... this looks great in my opinion. Very tempting to order. I love the look of black and orange. Great work guys.
Click to expand...

Thanks for the kind words. We are working hard on this bike.

The BCD is 104 for our bikes chain rings. I know Sempu offers other options but this is the most available standard.
 
A bit off-topic here:
Just to be picky, I i feel square taper is a little old-scool on such a bike :shock:
Wouldn't it be possible to use the new power meters cranks with bluetooth to determine how hard people are pedaling? :idea:
The crank arms communicate with the bluetooth controller, and controller adjusts power output after crank input?
I'm sure there is no solution for this today, but I think it should be doable, right??
Accuracy seems really good (+/- 1.5%), and one would have access to a new world of modern crank arms and BB's.

https://www.probikekit.co.uk/cyclin...ncy=GBP&shippingcountry=GB&variation=11678527

https://road.cc/content/buyers-guid...eter-buyers-guide-your-power-training-options
 
Personally I like the square BB. I might be forking out for my frame, but that doesn't leave a huge amount of $$$ for uber expensive power metering parts. I also don't like spending big on parts that get damaged easily like the cranks and rear derailleur.

At least for the kit, I think the BB being square makes sense.

Cheers
 
You are right. Taper square is last century tech and really not up to date.
I searched a lot for alternatives but there aren't any. The problem i see is, that hollowtech has a hollow axle (hence the name), so there is no space for electronics inside.
In case someone brings a torque sensing BB to the market at a reasonable price i'll be the first to buy one.
 
Cowardlyduck

I dont think a ISIS BB needs to be more expensive then a square taper BB, but it can if you want.
Also the XTR power metering crank arms was just for example. I myself would probably go for something like SLX level..

I just see Pro road cyclists use these crank arms to monitor their power input, so I just thought why not for PAS?
 
think in this case hollowtech or taped square is subjective, you will not be applying the same strength constantly over your pedals/crank/axle as if you were without motor
 
@Adam: Will you update this thread about SHIPPING DATES and stuff? Or how are customers (like me) informed of the progress. You webpage claims that the product is "in stock" and "ready to ship", which for sure is not the case (as you claimed in the opening post).
You may need to change that, so other buyers, not reading this thread will now that as well?!
 
Hello, Did not reply the last few days as I was on a shoot with the bike.

I need to check with Lucas the latest updates about motors and other critical path things.

https://lmxbikes.com/en/all-terrain-emtbs/140-lmx64-enduro-emtb.html

On the product page it says PREORDER and shipping from march 2019 in the description. Now I also added shipping from April for the next orders placed as all bikes of the first batch are sold!

About Square taper, I fully agree it is not ideal, but sempu confirmed that they can not create a ISIS version with the same sensor style and precision. Maybe if we ordered 1000pcs they would say different!

Here some cool shots we got on the video shooting. I will work on the video edit this week.

Still can't belive this spot is in France!

50976929_1003449386508808_3017823169550483456_n.jpg
50766529_1003449363175477_4754616392530001920_o.jpg
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Adam
 
Very nice. Really looking forward to getting mine. I think I'll pick blue for the colour. :)

I like to keep the mud off things...what mud guards will work nicely with the rear triangle design?

Cheers
 
I've disassembled these torque sensor, it will be very very hard to make on ISIS

bfHTusil.jpg

yeu9PNIl.jpg

HrW0ixsl.jpg
 
Thanks for the pictures Vasiliy.
Not a lot of room in there.

Side note, we received custom tubes for the first frames batch, so production of the first 12 frames will begin now.

Adam
 
Thanks Vasili. Thought the same thing. There is just not enough room for electronics if you use something like a hollowtech axle which is (hence the name) hollow and has a maximum large diameter and other bearings.
Let's hope the axle will not bend and the cranks not break.
Btw: has someone a source for STRAIGHT (not angled) cranks? The ones Sempu sent move the pedals 2cm to the outside, which is not necessary for my bike and puts even more stress on the axle.
 
bzhwindtalker said:
Side note, we received custom tubes for the first frames batch, so production of the first 12 frames will begin now.
Click to expand...
Thanks Adam. This is the kind of update i thought of. Keep the customers up to date and they will understand what happens and they will be more likely wait.
 
izeman said:
Thanks Vasili. Thought the same thing. There is just not enough room for electronics if you use something like a hollowtech axle which is (hence the name) hollow and has a maximum large diameter and other bearings.
Let's hope the axle will not bend and the cranks not break.
Btw: has someone a source for STRAIGHT (not angled) cranks? The ones Sempu sent move the pedals 2cm to the outside, which is not necessary for my bike and puts even more stress on the axle.
Click to expand...

We ordered the straight ones for serial production, we could get you one pair when the BB order arrives.
Adam
 
bzhwindtalker said:
We found some tricks to reduce sproket noise.
Click to expand...

hey nice to "hear" :D One thing you can sill do to reduce noise significantly is to throw out your red idlers and swap them for toothed ones, something i'd like to try with the LMX 161 in the next weeks. I used exactly those idlers you use on my firstself made middrive (the tongxin, more than 5 years ago) but upgraded to the toothed ones very quickly, since you need it quiet when you want to ride in the city.

This one is a good one, but there are more durable ones, you can do the same with #219 idlers, just add sideplates to the idler sprocket. Cheap but effective.
 

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I totally agree... Derailleur pulley's would reduce the noise compared to those chain guard pully's.
Are those pullys working as a chain tensioner because of suspension chain growth?
 
Adam

How long does the steerer tube of the fork need to be.
I have a fork with 180mm steerer tube. Is it long enough or do I need a new fork?
 
TorEddy said:
Are those pullys working as a chain tensioner because of suspension chain growth?
Click to expand...
not sure, hope bzhwindtalker will answer that. It could also be like this, a direct replacement with just s guide that smoothens the impacts of the links. still i like the style of those with the side flanges to keep the chain where it should. maybe we need longer teeth to make sure ict cams right with all this slack, do the LMX64 and 161 actually to have preloaded (and maybe damped) tensioners or are those ideler just guides? If they are just guides we know where there really is the problem though
 
Hello, the tension rollers are making some very minimal amount of noise compare the the chain rollers hitting the bottom of the sproket. We are checking other materials and items on the 64 sprocket noise reduction to improve further.
The two wheels are used to tension the chain, as there is some chain length variation with suspension compression. It is (heavily) spring loaded and on igus bushings. For the serial 64, we will include some sort of channel on the pulley wheels to center the chain. We could also try your solution CB. Sould be pretty easy to do on the cnc+manual lathe as long as we manage to center the wheel perfect.

Steerer lenght, the headtube is 140mm, with low stack headset. So 180mm should be OK.
I will check on our test bikes, even if the headsets are external it shoud give you some info.

Adam
 
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