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Rear HUB - Which type of freewheel?

Question:

I read in the doc that the fitting of a rear wheel is not recommended for 8 gears and more, but most of modern mountain bikes are equiped.
I guess this is a problem of space. Can you tell me the space needed for mounting on the rear wheel?
Thank you in advance for your info.

Answer:

Even though rear wheel drive conversion may seem more complex and not that fast as a front wheel drive, it has some advantages:

  • rear fork is stronger
  • disc brake fits more probably
  • "motorbike" design and feel

See picture bellow where you can see nine speed freewheel (it is not EVBike motor however the dimensions are the agree). You may need to use a washer to make a distance between freewheel and motor bigger (in case the chain interferes with motor). Another washer might be needed for the other side of the freewheel (in case the chain interferes with rear fork). These washers may higher the standard dropout 135mm a bit however it is not a problem in most cases.

Also please note that you must use a freewhell with thread, not cassete type!

For example see: http://sheldonbrown.com/freewheels.html

 
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