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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
shift kit
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. I'd like to put a shift kit on the motor, do you think it's possible to have a ...  | 
09-04-2008, 10:45 AM
| | Motorized Bicycle Newbie | | Join Date: Aug 2008
Posts: 8
| |  shift kit
I'd like to put a shift kit on the motor, do you think it's possible to have a 2nd derailleur with a small shifter, with like 2 or 3 gears? or will it be too small/cheap to handle the motor power and will not tension the chain enough? |
09-04-2008, 12:26 PM
|  | Motorized Bicycle Elite Member | | Join Date: Mar 2008 Location: Bellingham, WA
Posts: 536
| | Re: shift kit
Why do you want to use a second derailleur? What is wrong with the regular one? I don't think they make a left side derailleur but I could be wrong. |
09-04-2008, 12:37 PM
|  | Motorized Bicycle Elite Member | | Join Date: Jun 2008 Location: Longmont, CO
Posts: 1,597
| | Re: shift kit
You could run a right side derailleur upside-down, but I don't think it'd work with the big chain for the motor.
Then your rear freewheel would be the wrong way.
Not to mention the motor chain won't work on bike sprockets. So you'd need to change the drive sprocket to a suitable size for a bike chain.
By then, you might as well just get the SBP shifter kit and call it a day I think... |
09-04-2008, 05:16 PM
| | Motorized Bicycle Newbie | | Join Date: Aug 2008
Posts: 8
| | Re: shift kit
oh, i tought it was the same chain size.... well in this case i guess theres nothing to do except that it would be pretty expensive...
and i wanted to do it because i dont want to remove pedals... for cold days, its more useful to keep pedaling instead of engaging the motor... especially here in Quebec ^^ |
09-04-2008, 05:23 PM
|  | Motorized Bicycle Elite Member | | Join Date: May 2008 Location: Mesa, AZ
Posts: 290
| | Re: shift kit
With the SBP shift kit, you still keep the pedals and can pedal if you want to. |
09-04-2008, 06:04 PM
|  | Master Bike Builder & Forum Sponsor | | Join Date: Dec 2007 Location: Duvall, WA PNW
Posts: 2,685
| | Re: shift kit
Quote:
Originally Posted by datz510  With the SBP shift kit, you still keep the pedals and can pedal if you want to. | Indeed. Freewheels at the bottom bracket. |
09-04-2008, 07:57 PM
| | Motorized Bicycle Senior Member | | Join Date: Aug 2008 Location: High Plains Desert, Roy UT
Posts: 89
| | Re: shift kit
Have you thought about adding a "jack shaft" and adding your dive line to the main drive side? With the help of a canter-lever, you could actually bring the drive into play on the same side and still use your complete gear array.
I have chosen an engine with a pull start to make this transition simpler, and completely removed the peddles all together. Haven't thought about using the forward gears until just now, ooppss there goes the light bulb, just popped from being over loaded.
This aught to be real fun adding the three forward sprockets to jack shaft drive unit. 8-)
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