Custom extended swing arm extention, no more wheelies

[zombiess]

Some of these are going to need an explanation First of all, this swing arm is just the first pass to see how things are going to fit, there has been no attempt to smooth it out or make it pretty since it's a piece in work. When done it will be entirely powder coated black. Nice thing about doing it this way is I also have the option to change to a 24" or 26" wheel or mix and match. Rear brake will most likely just be regen only.

First up is this one, I aligned it next to my existing bike which is the gray one behind the yellow one. The yellow one just has a temp junk shock of a shorter length holding it together but I tried to line them up and take a picture to get an idea of what things will look like.

This one is the swing arm assembly all together with a temp wheel and old frame again

Just showing the width. Good news is because we made it so much longer I have the option of running whatever number of freewheel gears I want, bad news is the chain line is most likely going to interfere with the frame and require some kind of idler setup but that's pretty minor to deal with.

This is a shot of the original bike and geometry. The factory front fork and factory rear shock. This swing arm will most likely be transferred over to the gray bike unless I decide this frame is better and have it powder coated after the swing arm has some smoothing and finishing done. Front axle center to rear axle center is just over 44", my finished bike should be about 46" axle to axle.

Unfortunately we had to reuse the original dropouts from the frame which means I still need torque arms. The CNC guy is evidently weeks behind so even if I drew up some nice beefy drop outs to be cut it would be a month before they were ready and I'm not going to wait that long. Will probably try some pinch type setup. I'm also thinking of adding bolts for foot pegs to both sides of the swing arm near the axle so when I low side it I don't take out all the wiring coming out of the hub causing many hours of rewiring, blown FETs and blown halls.

This is how I'm going to be mounting the batteries. 30S3P

This is just another project he's working on, his own design from scratch for an iron worker who wanted a themed trike. Yes, that is an LS1 and 4L60E transmission

 

[neptronix]

....yeah, that should help eliminate the wheelies

Maybe you should just scrap the idea of an idler pulley and go single speed for that bike?
Take an extended length chain.. cut a bunch of links out of it until you barely have enough slack... and you're done.

I so wish i didn't live in an apt. and could weld to my heart's desire. I'd so do this. In addition to preventing wheelies, it looks mean.

 

[zombiess]

....yeah, that should help eliminate the wheelies

Maybe you should just scrap the idea of an idler pulley and go single speed for that bike?
Take an extended length chain.. cut a bunch of links out of it until you barely have enough slack... and you're done.

I so wish i didn't live in an apt. and could weld to my heart's desire. I'd so do this. In addition to preventing wheelies, it looks mean.

I still think the chain might interfere due to running a 48T chain ring. I like to pedal at low speed, but lets face it, this really isn't going to be much of a low speed bike. When the new motor gets here and if the controller handles it or I get one that does, I might be going just a little faster than I should. This bike should be doing 55mph this weekend for testing and modification with no chain. I just can't wait to finish this thing and be done now, all I want to do is ride and have the ability to still pedal at low speed.

 

[AussieJester]

HAHA nice trike...i think i would still take the Boosa sitting behind it... at least i thinkz its a Hyaboooosa
from what i can seez of it?

Those frames your using are on the tiny side i can see why wheeling is an issue haha the
extended swing arm should solve the problem OH what the ThudSTaR 8) has started
when he first extended the "Bullys" swing arm last year, a good thing catches on fast i guess!

KiM

 

[zombiess]

HAHA nice trike...i think i would still take the Boosa sitting behind it... at least i thinkz its a Hyaboooosa
from what i can seez of it?

Those frames your using are on the tiny side i can see why wheeling is an issue haha the
extended swing arm should solve the problem OH what the ThudSTaR 8) has started
when he first extended the "Bullys" swing arm last year, a good thing catches on fast i guess!

KiM

Yes, that is a Busa, but it's a low comp one because some day it will have a GT35R on it because my friend likes acceleration more than me. It will probably take a Busa pretty easily, but I don't know what's in that motor, it's one of the few non turbo one's he's done and is probably mostly stock. He is the reason I have the ebike because he told me about them back in January of this year, but I don't think he knew how far I'd take it. He loves riding it now and is really impressed with how powerful it is. My 30S/3P pack should give me lots of range too, I really love riding this thing, even if it's at 20mph pedaling on a bike path or drag racing a car from a stop light to 50mph. There is just something magical about bicycles.

I never saw what Thud did, but longer swing arm = longer lever from the axle which is the twisting force, also moves the center of gravity forward, both make it harder to lift the front end. I could probably spend a lot of time calculating all kinds of crap like actual COG, instant COG based of shock compression /etc, but I decided to just say screw it, make it 8 inches longer That should give me pretty close to 50/50 weight when sitting upright, but I'll have to scale it to figure it out. leaning over the handle bars should really help by making the split something more like 65 front 35 rear. If I want more stability I can increase the rake by going to a 24" front wheel or just a larger tire. Once this thing is running I'm going to have all kinds of options which I like. One of the best parts is the frames themselves were cheap! Combined I'm into the frames/swing arms for $60 total and the yellow one came as a complete almost new completely working bike (total junk parts of course).

Gotta figure out the chain line issue now. I'll probably have both bikes ripped apart tomorrow night to start working on them. When I'm done I'll probably convert the left over bike back into something very similar to what I had before for my Fiance to ride with the 20" RST shock which should work perfect for her since she is 95lbs. I'm hoping to go 60+ MPH on the one with the long swing arm if I get a good controller for it (on a different motor, not the 9c 2806 that on there now and good for 56mph).

 

[dogman dan]

Yay, no more loopies.

 

[acuteaero]

Nice work Z- this bike is looking quite a bit more legit than the Grange setup. In addition to helping with the wheelies and handling this mod should certainly help with the monkey-bike effect

 

[zombiess]

Nice work Z- this bike is looking quite a bit more legit than the Grange setup. In addition to helping with the wheelies and handling this mod should certainly help with the monkey-bike effect

yeah no kidding, every time I saw my self in one of the pictures on the track or on video I kept having the circus theme song going through my head because I looked rediculous.

 

[zombiess]

Current status

Should be much nicer after the rear shock mount is relocated higher and further back. Bike needs to be a lot lower and have more rake.

Just played around with it, looks like a 5" shock is the only real way to go. This is what I want it to look like. But that shock is dampened, just a spring which I guess is OK but rebound control sure is nice to have.