$200 Factory midtail from a Genesis 32" wheel bike..

[neptronix]

Good news.. ~127mm dropouts, fits 8 5s5ah lipo packs in the triangle, approximately 52 inch wheelbase ( 10 inches longer than an 'extra large' mountain bike ), looks like 1 1/8in front fork, good welds, very light too.

26 inch wheels look comically small compared to these 32's.

More pics, measurements etc later on

 

[neptronix]

OK, pics be here..

The real company name..

Unfortunately this bike can't be used at night, very disappointing, i think i'll return it and ask for a model that can be.. har har

The amount of warnings..... geez

The American company name..

Here is the 32in wheel compared to my 26in wheel with a 2.0 tire on it.

Looks like we've been shiested though, the outside diameter of the wheel is just ~31.25in

Meanwhile my 26in wheel is more like 26in plus a lil' more.

The rim of a 700c wheel measures about 25in..

Whereas the 32in wheel measures about 27.25in..

This is the genesis bike compared to my 21.5in extra large trek, both rear axles aligned... yeah, this bike is loooong.

Wheelbase is almost 52 inches. Yup - we are in midtail territory here.

Meanwhile the wheelbase of my extra large hardtail is a little over 42 inches.

Sliding dropout, which is about 127mm in the interior.. with a derailleur, the wheel can even go further back to extend the wheelbase.

From the center of the bottom bracket, to the seat tube, straight vertical is 18.5in..

Now if you measure this diagonally since this is a pedal forward bike, the measurement is about 20.5in, equivalent to being a large size height

From the center of the head tube to the center of the seat tube, this is about 26.25", which is ridiculously long.

OK, as usual i want to know if the falconEV/em3ev bag fits... it does, but not gracefully.

Can still comfortably fit 8 5ah lipo packs inside, which isn't too bad IMHO..

This is the bike with 26" wheels, as originally pictured at the beginning of this thread, to give you an idea of the length!

Compared to my trek 4500.

As for the frame, stretching the dropouts to fit 130-135mm shouldn't be too bad as they are about 125-127mm already.
The frame with fork, headset, and chain dangling off it is about 9.5 pounds. Not too light, not too heavy IMHO.

 

[Ykick]

26" wheel leaves nice space behind seat tube.

Pedal strike looks likely. Consider keeping the 32" front perhaps?

btw, my Model T used 31" tires, lol.....

 

[neptronix]

I would be definitely pedal striking on 26 inchers - i could run shorter cranks to prevent this, but ultimately yeah - i do have to go with a taller tire out back.

This bike relies on a rear coaster brake to stop it, so i can't keep the front 32" at speeds i wish to go A 29" or 26" front suspension fork has to go up front. Might keep a 26" x 2.5" out back, but it's more likely i will go with something like a 2.0" 29er wheel out back, so that i'm not messing the geometry up too badly.

26" wheel leaves nice space behind seat tube.

Pedal strike looks likely. Consider keeping the 32" front perhaps?

btw, my Model T used 31" tires, lol.....

 

[neptronix]

Ooooooh, i'm not a happy camper :lol:
I found a hub at the local bike store that was meant for single speed 135mm... it's got stupidly wide nuts on the end of the axle.. i figured, ok, i can prolly take the nuts off, or run shorter nuts..

Nope.. freewheel smacks up against the dropouts and chainstays.
A small gear on disc brake would do the same.

Barf.

http://www.ebay.com/itm/Fixed-Gear-...Cycling_Parts_Accessories&hash=item3f23c144c6

I am now thinking about designing something like this, that pushes the dropouts back by about an inch, but gets put on the outside of the dropouts to extend them to 135mm. I could then run a gear out back... not a big one, but one.

 

[mrdavies]

Hey Neptronix,
I'm following your build closely, as I've have always had my eye on this bike too! It's very cool you have it going...
Why not leave the large 32" in the back and mount a 29er wheel in the front with a new fork that has a disc brake mount on it.? Maybe a Mac 10t or 12? Keeping te 32 would be fab. Large wheels really make such a difference.
Good luck and keep us posted !

 

[neptronix]

Het Neptronix,
I'm following your build closely, as I've have always had my eye on this bike too! It's very cool you have it going...
Why not leave the large 32" in the back and mount a 29er wheel in the front with a new fork that has a disc brake mount on it.? Maybe a Mac 10t or 12? Keeping te 32 would be fab. Large wheels really make such a difference.
Good luck and keep us posted !

Your idea would work, but there are some holes.

1. I want to use a front suspension fork to get the maximum comfort factor here. Aluminum suspension forks bend under braking, and they also bend under high power too... they also have a tendency to break their dropouts under high power hubs. The result is not pretty!

2. The larger the wheel, the less power a hub motor puts out. 29" is really big. There's a member here who damaged his cromotor pushing ~4000W in a 29" wheel.

3. Front hubs usually have narrower stators. This means less power. I guess this isn't the situation with the MAC motor anymore, but i would want to run something more powerful. Unfortunately i can't.

4. Front wheel drive traction issues suck.

 

[t3sla]

Nice work and great for factor that's been neglected by the diy scene.

Just curious about you comments on wattage, what kind of power do you hope to achieve with such a ride?

 

[neptronix]

Nice work and great for factor that's been neglected by the diy scene.

Just curious about you comments on wattage, what kind of power do you hope to achieve with such a ride?

Hey there;
I don't want to run a ton of power through the bike, I intend to replace my Trek 4500 MTB with this, and run 1000-2000w.

A couple guys on gas bike forums have recommended this. I called the company and they are saying that it can tolerate 66cc 2 stroke power. Maybe that's 3 horsepower. I can't find a single report of a problem with these adapters, and apparently you can get them in sizes that match the walmart hub diameter..

http://mmbikeparts.com/sprocket_adapter.htm

I'm kinda uneasy about using an adapter like this, but it would take the sprocket inward a lot, which is a good thing, especially when dealing with narrow dropouts.

 

[jkbrigman]

A couple guys on gas bike forums have recommended this. I called the company and they are saying that it can tolerate 66cc 2 stroke power. Maybe that's 3 horsepower. I can't find a single report of a problem with these adapters, and apparently you can get them in sizes that match the walmart hub diameter..

(photo was here)

http://mmbikeparts.com/sprocket_adapter.htm

I'm kinda uneasy about using an adapter like this, but it would take the sprocket inward a lot, which is a good thing, especially when dealing with narrow dropouts.

Your Google-fu is strong, young Jedi.....

That's an impressive sprocket and mount set. You could do some very interesting things with that if you've got a low-cost, sprocketed motor up front. I think the only thing I might be concerned about is getting a cover of some kind over the chain drive, or at least a couple plastic tubes sleeved over the chain along with a bash guard or something on the upper front motor sprocket. I wonder if they would consider doing a belt drive too?

Not to be a muckraker, but might this have solved the problem with the "da bomb"?

JKB

 

[neptronix]

That's an impressive sprocket and mount set. You could do some very interesting things with that if you've got a low-cost, sprocketed motor up front. I think the only thing I might be concerned about is getting a cover of some kind over the chain drive, or at least a couple plastic tubes sleeved over the chain along with a bash guard or something on the upper front motor sprocket. I wonder if they would consider doing a belt drive too?

Not to be a muckraker, but might this have solved the problem with the "da bomb"?

JKB

I've actually seen this before while browsing the motor bicycle forums. Just doesn't look all that strong to me, so i discarded the idea of using one. I think i'd be OK with running this on the genesis bike though, know why? this won't be a high power beastie.

Looks like some people have used these with 66-80cc 2 strokers though on the gas bike forum though, so maybe they'll do what i think they will.

 

[neptronix]

Ooh, finally put the bike together today. I like it a lot. It does handle midtail-y. The seat post is super sketchy, that's gonna be the first thing to get swapped out O_O.. otherwise i like it!

 

[jkbrigman]

Ooh, finally put the bike together today. I like it a lot. It does handle midtail-y. The seat post is super sketchy, that's gonna be the first thing to get swapped out O_O.. otherwise i like it!

Hey hey hey! We want pics!

 

[neptronix]

Will get pics when i actually have something working!

Ordered up a white rockshox XC32 and a 29er front wheel. I think branching this out into a build thread will happen soon.

 

[neptronix]

Oh, i checked the diameter of the hub, it's 15.275in. This tells me that the clamshell adapter ( large size ) from manic mechanic will work. I ordered one up with a 40 tooth sprocket.

The rear wheel has 48 spokes. The Genesis single speed cruisers ( Onyx/Onex ) also have 48 spoke rear wheels. Many people have converted those, so i'm fairly sure the spoke pattern on the 32er will be OK with the adapter.

http://www.feltbicycles.com/USA/2013/Cruiser/Men-s-29er/Burner.aspx

In the meantime i am kicking myself a little bit for not buying one of these ---^
I dunno what the wheelbase is, but that looks like a long'un too.. and higher quality..

Not as cheap, but the components prolly aren't total junk, so that saves you $. Think about how good that would look with a 26" up front on a suspension fork and a larger tire, say 2.5" out back..

 

[neptronix]

I've got some excellent news!

This bike comes with a Shimano Cb-E110 hub ( or some equivalent copy ), which is standard on a lot of bikes like this.
The manic mechanic adapter looks to be designed around this hub.
The outer shell of the hub is steel.. the adapter is aluminum. That's good, because i was worried about damaging the shell of the hub.

Anyway, it looks like the clamshell adapter is a go. With the 40T sprocket, i've still got a really good chainline. The way the adapter brings the sprocket inwards is excellent. I could prolly go for the 48T option they offer :]

Now i just need to find the 29er version of this wheel.. and figure out how the hell to mount a motor.. might go with one of the 1000W MAC chain drive motors, or maybe a rc motor..

 

[Chalo]

might go with one of the 1000W MAC chain drive motors, or maybe a rc motor..

You know, a Unite motor would be a good spiritual match for a $200 department store bike.

The 40T input sprocket is too small for single-stage reduction on an ungeared motor (unless it's huge and torquey like an Etek), and too large for a gear reduction motor (unless you seriously overvolt it).

Maybe you could use a dinky little rear hub motor with a 16t to 22t freewheel and spin it at double or triple your rear wheel speed. That would make the motor happy and give you low-drag coasting as a side benefit. Making a mounting bracket would be more complicated than if you used a shafted motor, though.

 

[neptronix]

Oh, no doubt. A 31" OD wheel is going to spin at a slothy rate. There's gonna be no getting around doing a 2 stage reduction. Mounting the motor is going to be a pain in the ass, but the seat tube is ~1 1/4 all around, and that gives me a head start on putting together some mounting brackets.

I think your comment about the unite motor is kinda funny, though i've seen the specs on that motor and it is truly unimpressive.. 79% efficiency peak? bah! The little 6 pound 1000W MAC motor can push 86-87% efficiency at about the same RPM, at lower weight.

Your idea of a geared motor would be interesting. A Bafang BPM spun up to about 700RPM unloaded ( 3500rpm? internally ), then geared down 3:1 would prolly be a friggin' monster due to it's low pole count. hrmm..

I'd like to hook up the 2kw MAC to this baby tho..

 

[cal3thousand]

Subscribed... awaiting more pics too!

 

[neptronix]

My builds are not hard to find - see my sig....

The frame was by design logic. I got a deal on it on eBay. It's a pain in the ass.

 

[jkbrigman]

Low. Ride. Er.
Rides a little lowa!

 

[Neiler106]

I'm doing a GNG Gen2 mid-drive on the Genesis Ultra 32" inch (their 7-speed version). I have linked your thread on my own build for comparison.

(2nd Build) GNG Gen2 - Genesis 32" (Ultra 32 inch - 7 speed) @ http://endless-sphere.com/forums/posting.php?mode=edit&f=3&p=829565

This is about as close to a 'build-off' (not really) as I've seen on these forums. I never thought about doing a mid-tail from a bike like this and I like the idea of it. Not sure how it would work out with my mid-drive setup idea. I see tinkering in my future =).

From riding my stock frame around the block a few times, I think more weight up front is going to be essential. The long wheel base, weight disribution, and rider stance, makes for wide/slippy-feeling turns.

 

[CORBINFIBER]

build looks good ,,,im still interested in Buying them 32s off you let me know

 

[mlt34]

neptronix, what ever happened with this build?

I actually just stumbled upon this bike at walmart and also thought about doing a weird build with one. I like the idea of using the long frame as a base and swapping out to a smaller wheel. Any word on what happened, or didn't happen, with your build?

 

[neptronix]

Turned out to be a dead end. I donated the bike to my local co-op.

The fork angle for the front is just too extreme, which angled my suspension fork in a really bad way.
The rear dropouts are rather wimpy and also only fit a single speed ( 100mm? ) hub.
The aluminum tubing is also just a little too thin..

I could not find a decent way to motorize it, other than using a front hub. But then there's the fork angle issue.

It's continuing it's life as a walmart 29er front suspension bike with 29 x 2.3" geax tattoo tires, which i believe to be the tallest street tread tires you could possibly buy right now, giving you a diameter that's maybe within an inch of this bike?