Sprocket mounting

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cschade

Member
Aug 8, 2014
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I'm using the pedal crank as a jackshaft on my current motorized bike project. I need to mount a 50 tooth sprocket on the left side of the crank, opposite of where the usual sprockets are. How would I go about doing this. I don't have access to a welder, and my budget is very small :)

.scrag.
 
knightscape

knightscape

Member
Jul 29, 2013
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Maine
Are you sure about 50 teeth? That's a huge ring to have in the middle. What have you got planned for a complete driveline?
 
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cschade

Member
Aug 8, 2014
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United States
knightscape said:
Are you sure about 50 teeth? That's a huge ring to have in the middle. What have you got planned for a complete driveline?
Click to expand...
Well no, I'm not sure. I posted a thread asking about how many teeth to use. This is the drivetrain:

12 teeth on the clutch
(Trying to figure out how many) teeth on the left side of the pedal crank (jackshaft in)
Bike 3 gears (jackshaft out; right side of cranks)
Back freewheel

The bike gears are the same as on any standard bike. What size gear do you think I should have on the jackshaft in (left side of cranks)?
 
KCvale

KCvale

Well-Known Member
Feb 28, 2010
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Phoenix,AZ
cschade said:
I'm using the pedal crank as a jackshaft on my current motorized bike project. I need to mount a 50 tooth sprocket on the left side of the crank, opposite of where the usual sprockets are. How would I go about doing this. I don't have access to a welder, and my budget is very small :)

.scrag.
Click to expand...
Once you get your pedal arms cut off just measure your crank shaft diameter, you should be able to find a sprocket that will slip on and set-screw to it.

If you don't have a welder how do you plan to mount some foot pegs?
 
Last edited:
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cschade

Member
Aug 8, 2014
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0
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United States
KCvale said:
Once you get your pedal arms cut off just measure your crank shaft diameter, you should be able to find a sprocket that will slip on and set-screw to it.

If you don't have a welder how do you plan to mount some foot pegs?
Click to expand...
Thank you for the suggestion! I am using bmx pegs on the back axle
 
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