Yescomusa Rear Motor Adaption - Help Needed

[e-beach]

The bike I want has to have a rear hub motor. Despite the fact my front hub motor is running fine I decided to drive over the Yescomusa today and get a rear hub motor. (Takes me about 45 minutes each way.)

Because I am already running at 36 volts I decided to stay with 36 volts. Saves me the money and work of upgrading.

So I am thinking "I adapted a front wheel motor, how hard can a back wheel be?" Well right out of the box questions have crept up.

A quick check shows that as per other posts no rim tape was included. This didn't matter to me much as I expected it anyway. And I am going to put a different tire on this wheel with a heavy inter-tube and slime.

One side appears to be designed to allow a disk break to be added, but it also has an enormous sleeve over the axle.

The other side has the 6 freewheel gear cluster I was expecting, but the sleeve slides so far into the cluster that the cluster will rub on the frame if mounted this way.

Does anybody know it this is correct? Do I need to make some sort of spacer so the cluster doesn't touch the frame? And why does the brake side of the motor have such a big sleeve?

Any thoughts and help would be appreciated!

Thanks.

 

[shock]

I would measure it out and cut the big sleeve in half to center the rim in your frame.

 

[chisixer6]

I don't think you should cut that sleeve in half. Mine fits just fine, I have no frame rub. I'll have to check when I get home tonight. I think I only have the sleeve on the disc brake side, not sure at the moment.

 

[wesnewell]

You've got sleeves (spacers), washers, and torque washers. Use them so the wheel is centered in swing arm. Would be best to use the torque wahers so the tab goes into the dropout to provide added protection from wheel spin out. Always use at least one steel washer between the spacers and dropouts are you will crush the spacers. After crushing one of mine, I threw it away and used a jam nut on the inside and never had another problem. You will likely need at least 2 washers on the freewheel side to clear the freewheel from the frame.

 

[dogman dan]

Perhaps the right hand, freewheel sleeve is longer than the other one? Perhaps the wrong one is on the freewheel side? I'd look at that first.

If they are the same, get out the washers and figure out what you need to get it all lined up. Chances are, you don't have to cut down the disk side one. But depending on how many washers you add to the right side, you might have to take some space out of the left side. Alloy frames can't be bent much wider than about one thick washer. Steel you can bend out much further.

Looks to me like one washer will get your freewheel clear of the frame. Perhaps the tabbed washer just needs to go inside the frame instead of outside.

Don't forget your torque plate, torque arms.

 

[e-beach]

Perhaps the right hand, freewheel sleeve is longer than the other one? Perhaps the wrong one is on the freewheel side? I'd look at that first.

Turns out the sleeves are the same size. And, of course, the side that needs at least 1 washer is the side that has the connector in the way. :x

Not that big a problem I guess...I will just carefully bend the connector tabs flat with a jewelers screw driver and carefully dissemble the connector so I can slip a washer over the wires.

.....to center the rim in your frame.

You've got sleeves (spacers), washers, and torque washers. Use them so the wheel is centered in swing arm. ....

If they are the same, get out the washers and figure out what you need to get it all lined up....... Alloy frames can't be bent much wider than about one thick washer. Steel you can bend out much further.....

Ok, the consensus clearly says the assignment is to figure out a way to get the rim centered in the frame using washers in a way that does not bend my aluminum allow frame.

BTW, I went to my local DIY Bike Coop (Bikerowave for the LAliens among us.) and one of the mechanics told me that the threaded side of the hub looked like the threaded mount of drum brakes.

Could it be that this hub is set up for a bicycle drum brake?

 

[TiagoSantos]

I'd say it's probably threaded for something like this - http://ebikes.ca/store/photos/DiskT-6in.jpg

Probably not something you'd normally see anywhere but China!

 

[wesnewell]

Could it be that this hub is set up for a bicycle drum brake?

No, it's for adding disc brakes. They make a kit that contains all you need I think.
http://www.conhismotor.com/ProductShow.asp?id=72