My First Ebike Build Cromotor Lyen Mongoose Beast Fatbike

nerve said:
Endomorphs on the way...thanks Chalo
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Awesome. You'll dig 'em. They are at least 7 pounds lighter than the Beast's stock tires (for the pair).
 
Chalo said:
Do the engineers at Lotus glue on their brakes? Do they glue on their transmissions? No, they do not. That is the sort of thing we're talking about. And it is a dumb way to fasten a safety-critical item that has plenty of thickness to accept screws.
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no, that's not the sort of thing we're talking about.
what we're talking about forms part of the frame.
brakes & transmissions aren't structual elements (well, the transmission is in some earlier Lotus).
if tx didn't wear out & require disassembly perhaps they would be glued shut, have to think about that.


besides any adhesive used on a bike only has to exceed the strength of a brazed joint, it doesn't even need to equal that of a weld.
this is already old-tech that has been proven in combat & i'd take that over the welds on your fav bso mules.
 
Chalo said:
nerve said:
Endomorphs on the way...thanks Chalo
Click to expand...

Awesome. You'll dig 'em. They are at least 7 pounds lighter than the Beast's stock tires (for the pair).
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He's using Minions which are 1.33kg for 2.5" and 1.38kg for 2.7".
Surly EM weight close to 1.6kg and require a heavier tube.
Where this 7lb saving comes from?
 
full-throttle said:
He's using Minions which are 1.33kg for 2.5" and 1.38kg for 2.7".
Surly EM weight close to 1.6kg and require a heavier tube.
Where this 7lb saving comes from?
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I said compared to the Beast's stock tires (which weigh about 3kg each).

Measured weights I have seen for Surly Endomorphs vary from about 1300g to over 1600g. Comparing their weight to knobby tires with less than half the volume is sort of pointless-- but for what it's worth, they are in the same weight range at the low end of the variation.

A bike with 2.5" tires isn't a fatbike, and doesn't ride like one. Besides, 2-ply downhill knobbies are crap for general use. That's why after designing a custom bike around Nokian Gazzaloddi 26x3.0 tires, and spending way too much money on those knobbies, I never use them. They are dishearteningly slow and have terrible ride quality for their size. I prefer to ride trails on fat, low pressure street tires rather than use 2-ply knobbies that feel like tractor tires at any pressure.
 
The implied part is that the OP got a bike that comes with certain tires, and for whatever reason, he switched them out. To me, that suggests there was an issue with the original tires. If that issue was excessive weight or poor handling, both of those things can be addressed to some degree by Endomorphs without recourse to lower-volume tires.
 
I'm using stuff that's available to me...this is my first build and I wanted everything working out before dropping more $$$. Working my way through cost and function...

After I ebayed the stock rims, tires, and forks...the frame was free...CroMotor came already laced. Surly recalled the 100mm Pugsley fork so i'm kinda stuck again... :pancake:

Back to my original question: Can I add a 24V battery in series and get more range if keep the throttle at 25mph?
 
The greater the number of cells in your pack the more range you can get in theory. If you can keep your speed down it does werq. I can count my number of cells, in my pack, and get a rough estimate of my max range. In reality when I went from 36-48V I got no measurable improvement in range until I watched my driving habits closely.
 
What is the head tube size? Not that I would ever think of changing the bike's geometry by adding front shocks with disc brake mounts, but if I did... Are there there even QR fat rims with disc mounts available out there?
 
100volts+ said:
What is the head tube size? Not that I would ever think of changing the bike's geometry by adding front shocks with disc brake mounts, but if I did... Are there there even QR fat rims with disc mounts available out there?
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One problem with that idea is that fatbike tires don't fit into any currently available suspension forks I'm aware of. Drunkskunk can probably elaborate further on this point. Another problem is that inflated fatbike tires don't want to squeeze past the disc calipers on 100mm wide forks, which is why most fatbikes use 135mm forks.

J&B Importers lists a replacement wheel for the Origin 8 Crawler fatbike. It's got a 135mm front disc hub with sealed cartridge bearings, and an 80mm wide rim. It costs $150 at full retail. They also list a Wheel Master brand loose ball 135mm front disc hub that costs $30 at full retail.

As for finding a 135mm suspension fork, you're on your own. It might be plausible to make special wide triple clamps for existing fork legs.
 
biohazardman said:
The greater the number of cells in your pack the more range you can get in theory. If you can keep your speed down it does werq. I can count my number of cells, in my pack, and get a rough estimate of my max range. In reality when I went from 36-48V I got no measurable improvement in range until I watched my driving habits closely.
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thanks bman...I'm gonna add a 12v 15ah and see how it goes....identical cells and all...
 
Nipple shot!

Went with a set of Black Floyds at the last minute...Got the rear tire changed today...Waiting on a VooDoo Zombie 500 100mm Fork before I can swap out the front tire...What a difference with just the rear swapped out...can't wait to do the front!

floyds.jpg
 
I'm a gainfully employed mech eng Ph.D. I'm in.

And in my daily work we use glue all day and every day to bond the friction puck to the steel (shotblasted) backing plate on every car brake-pad we make. We shear test and understand the variables. 6 million times a year in a joint venture between Honeywell and Bosch.

At a high level it depends on the surface area, and surface roughness. Lotus also used aluminium bead blasting on their detonated tubs in Finland prior to glueing. Having spent time at Koenigsegg in Angelholm Sweden I can attest that they of course roughen and bond their carbon fibre tubs.

16 square inches of glue to metal surface will defeat a 5mm screw any day on shear and lateral pull strengths. And it can be make tough (a combination of strength and flexural resistance) but a screw will work harden. Our glue resists dyno testing at 280 celsius.

The glue isnt dissimilar to that which bonds the sole of your skate shoes to the casing. No screws there please.

But how much surface area are we talking in this pissing match today?
 
Hi Samd...all I read was...'Having spent time at Koenigsegg in Angelholm Sweden'...lol drool..,

this is the piss test:
IMG_0235.JPG

IMG_0232.JPG


These torque arms are glued on with DP420. Sanded down and cleaned with acetone, set with a hairdryer on high for 25mins...the torque arms failing are the least of my worries on this Beast...

As for the phase wires: lowered the amps from 60A to 45A and it seems to be better for now...
 
nerve said:
Man...did I get lucky here...the 2.5" rim with the Black Floyds fit the Zombie-500 like a glove! Had the supplier sent me the 3" rim that I had originally ordered...I would've been SOL...
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They look just right on the rims, too-- like a 2" tire on a 1.25" rim, who'da thunk it?

Please let us know how they behave at high and low pressure, if you will. I've seen some feedback that BFs tend to tuck under when turned hard at low pressure, but I suspect that's when they are mounted on very wide rims.
 
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