GNG, 1000W 48V BB-drive, $400

[Denisesewa]

s:

That hyperion charger sounds great, I think I'll go with that instead as I can get it for around $160 shipped to Canada on eBay.

It would be nice to take full advantage of the charger with some 7s packs but I couldn't find any with a capacity close to 8000mah like the 6s pack.

Good to know that the stock controller can be modified, will be trying that before I buy a new one as well.

Will these 5mm bullet connectors be good for hooking the battery up to the controller?
http://www.hobbyking.com/hobbyking/store/__9194__EC5_5mm_Connector_Pair_.html

Do I need any adapters for connecting the 5mm bullet plugs on the battery to the 5.5mm bullet plugs on the hyperion charger?

I'm also grabbing some of the turnigy 12awg wire to hook everything up: http://www.hobbyking.com/hobbyking/store/__9674__Turnigy_Pure_Silicone_Wire_12AWG_1mtr_BLACK.html

Anything else I'm forgetting?

Thanks again for the excellent suggestions!

Keep in mind that all these chargers run on DC voltage, so you need a power supply, I found my small power supply limits the output of the charger due to the low voltage so I can only charge the full 14s 2p pack at 2 AH, I will end up buying something like this eventualy.http://www.ebay.com/itm/270785432198?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 but alot of people just use car batteries or a car battery charger.
The hyperion comes with some lead cables so you just have to solder on your connector of choice, you may want to make longer leads for convenience.
you could just add a 2 cell pack to get your 14s, I found that the bullet conectors that came on the batteries worked great for setting up a series connection for 3 batteries, I used these same type connectors through out the 2nd build,kinda nice to use the batteries just the way the came out of the box.

 

[kfong]

Your looking good these days, I like the manual. Something I need to work on. Great vids, keep the coming!

New GNG performance video :
[youtube]rBDC4gu8n2A[/youtube]


The adjustable plates look great! good job!

 

[LightningRods]

The adjustable plates look great! good job!

Thanks! I'm very pleased with how they've turned out. I had no idea what this local shop would be like. Turns out that they have two $300,000 production lasers and do great work. I'm going to design an aluminum battery box next and have them cut and bend it for me.

9 out of the initial run of 10 sets are spoken for. We can add as many as we want to the run. No doubt more will be made later but we'll have to get a group together again to get the good price of $20. They were going to charge me $150 for doing just one set!

 

[Chalo]

I have examined your drawing, assuming that the right side of the drawing is the right side of the bike.

It looks to me like drive chain tension will be applied to an overrunning freewheel on the right side when motor power is applied and pedals are idle. If I'm mistaken, please help me interpret your drawing.

Chalo,

The motor drive torque is only applied to one, well supported, element of the RH freewheel. It doesn't load the freewheel bearing, that's the crucial factor.

I got it now. The orange part picks up the 4-tooth remover spline, right? That is clever. It looks like the RH freewheel provides the bearing that supports the rider's weight, though-- so it had better be a White or other radial bearing equipped model.

An American bottom bracket shell would make your design easy to implement, even with a tubular crank spindle.

 

[bzhwindtalker]

I had a small issue yesterday when downhill biking in the montains...

Anybody have a nice website to order isis trial cranks? I have no confidence in the cheap alloy cranks that came with the kit :x

 

[Denisesewa]

In Europe the best source would likely be Tarty Biketrials >>http://www.tartybikes.co.uk/

 

[LightningRods]

I had a small issue yesterday when downhill biking in the montains...

Anybody have a nice website to order isis trial cranks? I have no confidence in the cheap alloy cranks that came with the kit :x

?????? What caused that? Some kind of impact damage? I don't see how torque on the jackshaft would do that.

I hate the stock crankset as well. Still looking for quality options....

 

[Denisesewa]

BTW what do you think caused the bearing block failure, Was it loose?

 

[Denisesewa]

I picked up a set of used Middleburn trials cranks I am going to use although they are square taper and need a good polishing job, at least I know these wont fail, still have the issue with the BB spindle being soft, ISIS would be a great way to go.

 

[LightningRods]

I picked up a set of used Middleburn trials cranks I am going to use although they are square taper and need a good polishing job, at least I know these wont fail, still have the issue with the BB spindle being soft, ISIS would be a great way to go.

Do trials cranks thread in on the RH side? I was looking at White Bros cranks this morning but the attachment seems wrong for a front freewheel.

In talking to my metal shop that cut the adj sheets they said that they can lathe cut just about any kind of steel.....

 

[Tom Tom]

Anybody have a nice website to order isis trial cranks? I have no confidence in the cheap alloy cranks that came with the kit :x

I just got these from webcyclery in the states. Crappy cell phone pic but, very well built. Cost about 85 usd. Looking to match them up with SKF isis bottom bracket.

http://www.trialtech.co.uk/product.php?product_id=8
http://webcyclery.com/product/trialtech-sport-forged-isis-cranks-1978.htm

 

[Denisesewa]

I picked up a set of used Middleburn trials cranks I am going to use although they are square taper and need a good polishing job, at least I know these wont fail, still have the issue with the BB spindle being soft, ISIS would be a great way to go.

Do trials cranks thread in on the RH side? I was looking at White Bros cranks this morning but the attachment seems wrong for a front freewheel.

In talking to my metal shop that cut the adj sheets they said that they can lathe cut just about any kind of steel.....

Yep, modern trials bikes use a forward freewheel and are made just like the stock GNG units but they a brutally strong.

 

[Denisesewa]

Anybody have a nice website to order isis trial cranks? I have no confidence in the cheap alloy cranks that came with the kit :x

I just got these from webcyclery in the states. Crappy cell phone pic but, very well built. Cost about 85 usd. Looking to match them up with SKF isis bottom bracket.

http://www.trialtech.co.uk/product.php?product_id=8
http://webcyclery.com/product/trialtech-sport-forged-isis-cranks-1978.htm

How wide a bottom bracket have you found?, thats been the main concern with ISIS.

 

[bzhwindtalker]

Thanks for those links, I will try to find an european supplyer.
The bearing block failure was caused by the primary chain that jumped off the 44t ring and wraped itself around the drive sproket, getting stuck between the bolt head and the bearing support core.

 

[Tom Tom]

How wide a bottom bracket have you found?, thats been the main concern with ISIS.

I'm far from an expert at this and kinda learning as I go but, do you mean the shell width? or length of bracket?

 

[bzhwindtalker]

I looked around a bit and it seems like 128mm is the max. I checked with a 121mm I have and it does not seem to fit (right crank hits the drive sprocket)

 

[Denisesewa]

How wide a bottom bracket have you found?, thats been the main concern with ISIS.

I'm far from an expert at this and kinda learning as I go but, do you mean the shell width? or length of bracket?

The shaft itself, As BZH just said there are clearance issues.

 

[Tom Tom]

I'm not familiar with the clearance issues with the gng drive as I don't own one.

I'm building a mid drive starting with the freewheeling crank as I don't like the setups included in the various "kits".

I had read bzhwindtalkers post about isis cranks and figured I'd give a shout out for the trial tech cranks that I just got in the mail.

I have a 68mm x 113mm isis bottom bracket on the way to match the existing setup on my test bike. I haven't looked for other sizes.


I just looked up the gng bracket and now I understand that you need a WIDE bracket as there's is 150mm!

 

[Seya]

Hi All..

kinda off topic but..

I was doing the math on the gear reduction and it seems this kit is not optimally geared for someone who wants to do major hill climbing while pedaling. The motor runs efficiently at 3000 rpms but the cank would then be turning at 142 rpms.

Per this thread (GNG 450 watt has a 3000 rpm rated motor with a total of 21:1 gear reduction which puts crank sprocket at 142 rpms)

This is less than ideal when you consider 50-80 rpms to be realistic/confortable/sustainable climbing pedal cadence.

Does my math check out here?

 

[Denisesewa]

Hi All..

kinda off topic but..

I was doing the math on the gear reduction and it seems this kit is not optimally geared for someone who wants to do major hill climbing while pedaling. The motor runs efficiently at 3000 rpms but the cank would then be turning at 142 rpms.

Per this thread (GNG 450 watt has a 3000 rpm rated motor with a total of 21:1 gear reduction which puts crank sprocket at 142 rpms)

This is less than ideal when you consider 50-80 rpms to be realistic/confortable/sustainable climbing pedal cadence.

Does my math check out here?

Its not off topic, but all this was discussed several times throughout this thread, the solution seems to be to replace the chainrings although I dont know of anyone who has done it yet, In the real world with an overvolted and overamped setup the bike climbs virtually anything I want it to go up without slowing enough to pedal, even stock the pedals are mostly good for a ( get home out of juice) option, so yes, everything youve said is correct ( didnt check the math)

 

[Rassy]

saamilapp wrote:

I was doing the math on the gear reduction and it seems this kit is not optimally geared for someone who wants to do major hill climbing while pedaling. The motor runs efficiently at 3000 rpms but the cank would then be turning at 142 rpms.

I've seen this high rpm issue discussed several times also. But often not included in the discussion is that the 142 rpms at the cranks would be an unloaded speed. By the time you add a load plus consider the losses in the reduction system you probably lose close to 50% of your speed. In my case I find I can keep up in high gear or when climbing steep hills with the stock setup using a nominally 48V Ping battery. And, I am not a high cadence guy. I programmed my auto shift NuVinci on my trike to keep my cadence betwen 60 and 70 rpm.

Of course if you run at higher voltages it will spin faster.

 

[LightningRods]

The order for the first beta production run of adjustable sheets is at the CNC shop. I stuck my neck out and ordered 10 sets for the Forum to get a better price. Thanks to your support I sold all of those and had to order more. In addition to the sharing of valuable knowledge and experience this is another great thing about E-S. We can go in together and have custom parts made at prices that start to become reasonable. I'll be contacting everyone who placed an order to wrap up billing and shipping. Everything will go out this week.

If you've found this post late, as often happens, and want a set of adjustable plates for your Gen 1 GNG send me a PM and I'll see what I can do. The initial run is sold out as of 1/14/13.

 

[Kai]

I have a 68mm x 113mm isis bottom bracket on the way to match the existing setup on my test bike. I haven't looked for other sizes.

I just looked up the gng bracket and now I understand that you need a WIDE bracket as there's is 150mm!

I would also like no know where to buy ISIS bottom bracket with 150 mm axle. Or even a square tapered one.... Could anyone help?
Because I'm going to upgrade my GNG kit with better parts, but it's not easy to source parts. [edit] Original crank arm freewheel must have been 16 t since 17 t shimano freewheel is too big to fit inside the freewheel assembly and coqwheel. Anyway the freewheel assembly has really bad chain line with 7 speed cassette, if not modified.

Could anyone tell me how to remove the little freewheel on jackshaft? And can it be replaced with this freewheel adaptor http://www.ebay.com/itm/Freewheel-A...Cycling_Parts_Accessories&hash=item4abe914b55?

 

[Denisesewa]

I have a 68mm x 113mm isis bottom bracket on the way to match the existing setup on my test bike. I haven't looked for other sizes.

I just looked up the gng bracket and now I understand that you need a WIDE bracket as there's is 150mm!

I would also like no know where to buy ISIS bottom bracket with 150 mm axle. Or even a square tapered one.... Could anyone help?
Because I'm going to upgrade my GNG kit with better parts, but it's not easy to source parts. Even a shimano freewheel with same tooth count is too big to fit inside the freewheel assembly and coqwheel. I have to ream chainwheel holeabout 2 mm.

Could anyone tell me how to remove the little freewheel on jackshaft? And can it be replaced with this freewheel adaptor http://www.ebay.com/itm/Freewheel-A...Cycling_Parts_Accessories&hash=item4abe914b55?

I installed a GT 120 point engagement freewheel into the chainring adapter, fits perfect (16T), still has some runout but better than stock and now has instant pedal engagement. The ACS claws is slightly larger but I didnt try to fit it. the best deal on the gt freewheel is here, as soon as he sells one he puts another up for sale.
http://www.ebay.com/itm/GT-BRAND-16-TOOTH-BMX-Bike-GEAR-RATCHET-FREEWHEEL-NEW-IN-BOX-/140906045685?pt=Cycling_Parts_Accessories&hash=item20cea7a0f5

 

[Thud]

I have a 68mm x 113mm isis bottom bracket on the way to match the existing setup on my test bike. I haven't looked for other sizes.

I just looked up the gng bracket and now I understand that you need a WIDE bracket as there's is 150mm!

I would also like no know where to buy ISIS bottom bracket with 150 mm axle. Or even a square tapered one.... Could anyone help?
Because I'm going to upgrade my GNG kit with better parts, but it's not easy to source parts. Even a shimano freewheel with same tooth count is too big to fit inside the freewheel assembly and coqwheel. I have to ream chainwheel holeabout 2 mm.

Could anyone tell me how to remove the little freewheel on jackshaft? And can it be replaced with this freewheel adaptor http://www.ebay.com/itm/Freewheel-A...Cycling_Parts_Accessories&hash=item4abe914b55?

don't know where to look fir odd size ISIS...but you can get a full asortment form here:
http://www.sickbikeparts.com/catalog/index.php?cPath=23&sort=2a&page=2&osCsid=dkrgr7npjtp955bq6llf24j6v1
http://www.sickbikeparts.com/catalog/index.php?cPath=23&sort=2a&page=1&osCsid=dkrgr7npjtp955bq6llf24j6v1

or the cycleone web site.