10 inch motorbike rim and hub motor

[Justtoby]

Hi All,

I am about to start work on a low rider custom chopper e bike. I want the build to work off a mahooosive 10inch rear Chopper wheel and tyre, the sort of thing you would see on an OCC motorbike chopper.

I have sourced a bike chopper frame in steel so I can mig weld it, so the front end is all done and I will cut off the rear forks, add an extension piece and weld it back to allow for over a foot wide on the rear.

I wonder if I can get someone to lace a hub motor in to the rear motorbike rim as it would need to be offset to get the chain on and the axle would need to be much longer...any ideas?

I have 900mm long chopper front forks that come with the frame, I will weld in a BMX bottom bracket to the rear where the seat tube goes down, this will allow the front mounted chopper style pedals to link to the rear and then I will add another bmx bottom bracket alongside to support an extension going out to meet the rear line of the chain going to the motorbike rear end. So there will be 2 chains linked and the MK2 build will probably see a 5 speed cassette under the seatpost tube to allow the pedals to change gear.

If this is too complicated for a rear hub then I will need to lace in a front hub so that only the pedals turn the rear wheel.

So, in summary, how do I get the read hub motor to work in a WIDE motorbike hub?

I had thought of a mid mount hub but don't really like that as it will spoil the looks of the bike.

 

[Justtoby]

I have found a motorbike company doing large hub motors and even double hub motors so that could be an expensive solution. I will not really need this to do more than 20mph, I know the weight of the wheel and tyre will limit things a bit.

Still keen to see if anyone has had any experience with extending the spindle and the flange for the rear freewheel?

 

[Justtoby]

Another option is to use something like a Mercedes sprinter VAN wheel and have it chromed for the look, this may allow the hub motor to be bolted to the inside in some way and then see if I can get the chopper tyre mounted?

I have found that a Ninja ZX9r has a 6 inch rim and can take a 190 profile tyre, that would probably be wide enough for the look that I want.

 

[Justtoby]

Got my 240/40/18 bike tyre mounted up today, the chopper build begins.

 

[SlowCo]

Subscribing. Would love to see some photos of your progress.

 

[Justtoby]

Cool, I will take a load of pics as I go, battery ordered and I will use a bafang mid drive.

 

[Justtoby]

I will get some pics up soon.....I promise!

Update so far: I have the motocross spokes laced in to the rear rim...many wheel builders said it couldnt be done so I did it myself and it seems to work with a tripple cross for lots of strength and less tension on the spokes.

I am having to re-cut and re-weld the rear axle to match the new width and I had to make a flange to allow the bigger gauge spokes to fit on the hub, this allowed me to fit a disc brake to the rear too.

I will mock up the new axle this week and then hopefully I will be able to fit the Bafang HD 1000w (1500peak) to the frame and see how the chain lines up. Allex is making me up a 30q 52v pack that fits in a Harley Davidson leather pouch across the front forks which are a massive 1000mm long in chrome (with front dics)

My 3 inch wide front wheel is being powder coated and laced this week.

Frame will then go off for powder coat as soon as the mocking up is finished, I think I will need some extension wires for the bafang though as the forks and bars are too long.

 

[Dauntless]

http://leafbike.com/products/e-motorcycle-motor/10-inch-rim-motorcycle-motor/350-10-72v-4000w-electric-motorcycle-motor-717.html

Why do you want such a small wheel?

 

[Justtoby]

http://leafbike.com/products/e-motorcycle-motor/10-inch-rim-motorcycle-motor/350-10-72v-4000w-electric-motorcycle-motor-717.html

Why do you want such a small wheel?

10 inch WIDE. It is an 18 inch tall rim. Tyre is 240/18/30 chopper tyre (240mm wide)