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Hubs, Gearboxes, Sprockets and Chains Can't find 'em, grind em - hubs and transmissions, problems and modifications to make you run smooth and trouble free

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  #121  
Old 06-22-2014, 01:37 AM
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Default Re: motorized bicycle 44 to 36 tooth sprocket swap

ok so I have three of these motorized bikes 2 are 700c bikes and with the stock 44 tooth sprocket it goes 40 and it only has 10- miles on motor. my question if I change to a 32 tooth what could reasonably be my top speed???? also the fixie bikes that walmart sells work great if you take the fixed sprocket off and add two 1/3"
washers to the motor drive side and one to the pedal side it makes the chain farther away from the frame. I have a 49cc and two 80cc bikes and just wonder how long till the rings wear in???? the book says 200 miles but that must be a crazy number
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  #122  
Old 06-22-2014, 09:38 AM
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Default Re: motorized bicycle 44 to 36 tooth sprocket swap

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Originally Posted by DRBS View Post
ok so I have three of these motorized bikes 2 are 700c bikes and with the stock 44 tooth sprocket it goes 40 and it only has 10- miles on motor. my question if I change to a 32 tooth what could reasonably be my top speed???? also the fixie bikes that walmart sells work great if you take the fixed sprocket off and add two 1/3"
washers to the motor drive side and one to the pedal side it makes the chain farther away from the frame. I have a 49cc and two 80cc bikes and just wonder how long till the rings wear in???? the book says 200 miles but that must be a crazy number
I wouldn't go smaller than a 36T on the bike personall, especially if the ngine is basically just a stock set up, a 32T may b to small for you engine to pull and will really hurt the bikes ability to pull you up hills, on my bikes the 36T has always been a good size for good cruising speed at lower rpms than you have ith a 44T and still has enough grunt to pull me up the hills where I live.

200 miles for a good break in period may isn't a crazy # sometime some of these engines dont reach there best and smoothest running until twice that and others will be settled in nicely at 150-200 miles, just depends on how smooth and true everything in the engine is from the beginning really and also depends on how the engine is run, if someone just putts around and never really revs the ngine mch for long stretches it may take longer for it to settle in and vise versa.

Map
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  #123  
Old 06-22-2014, 03:27 PM
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Default Re: motorized bicycle 44 to 36 tooth sprocket swap

well one has had the port work done its using the runtong carb on a offset intake also a hooker header exhaust the other has just had the port work and a little more aggressive than stock exhaust so I would have to say there not stock but modified
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  #124  
Old 06-22-2014, 10:53 PM
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Default Re: motorized bicycle 44 to 36 tooth sprocket swap

If you are a lghter weight rider and you dont have many hills and just mainy ride longer flat stretches of road without a lot of stop and go town riding a 32T on a 26" wheel may work just fine for you.
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  #125  
Old 06-22-2014, 10:59 PM
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Default Re: motorized bicycle 44 to 36 tooth sprocket swap

im 170 and the bikes im using are the new 700c bikes 90% of the mountain bikes are now "unisex" and the holes are too small for the motors the beach crusers are going that way too pretty soon we all will be using the 700c bikes the best one I have found is the thruster fixie Walmart sells for 80.00 the only thing you have to do is place washers on the motor drive side and im using the hardened washers that are 1/8" thick two on one side 1 on the pedal side
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