Fixie Thruster motorized bike build

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a0201618

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Jul 22, 2012
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Texas
I bought a Fixie Thruster to put the kit on and I was wondering since there is a sprocket on both sides of the hub could I replace the fixed sprocket with a 44t instead of bolting the one that is with the kit on? I would much rather just replace the one on the motor drivetrain side with a 44t. Thankyou The motor kit is an 80cc..
 
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a0201618

New Member
Jul 22, 2012
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I just ordered a threaded 36 tooth sprocket.. That should work right? and I should have a higher top speed with lower rpms needed?
.wee.
 
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longo3

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Jul 23, 2012
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tennessee
I used my dremel to make the sproket hole fit on the fixed cog and bolted the motor's sprocket directly onto the fixed cog. The bolt holes lined up perfectly with the cog teeth. This entire bike is built for these motors- The right size pipes, sprocket ready to bolt to fixed sprocket(with just a little dremel), and lots of room in frame.
 

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george_n_texas

george_n_texas

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Sep 4, 2009
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Well if it's the one I saw on Niagra I doubt it the chain is way wider than a bike chain and so is the sprocket that comes on the engine so I'm guessin it'll slip off. Here are a few other considerations: the less teeth means higher speed at top end but lower torq at low end which means a lot of peddle assist. The fixie has a very large wheel 700c so I'd go with the biggest sprocket that will fit. I weigh 240lbs so low end torq is important.
 
locell

locell

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Jan 16, 2010
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longo3 said:
I used my dremel to make the sproket hole fit on the fixed cog and bolted the motor's sprocket directly onto the fixed cog. The bolt holes lined up perfectly with the cog teeth. This entire bike is built for these motors- The right size pipes, sprocket ready to bolt to fixed sprocket(with just a little dremel), and lots of room in frame.
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"a little dremel" what did you dremel out? I did this same exact thing on the same exact bike but ts came out where the sprocket was not centered. Although solid, it goes up and down when spun
 
george_n_texas

george_n_texas

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If it goes up & down it's gonna wear out your chain in a hurry gotta be centered...I filed the inside of one of my sprockets to make it fit over the outside of the hub but I did it by hand with a curved file (the back side of a flat file) and frequently put it back on the hub to take just a bit of material off at a time to get it centered.
 
locell

locell

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Jan 16, 2010
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george_n_texas said:
If it goes up & down it's gonna wear out your chain in a hurry gotta be centered...I filed the inside of one of my sprockets to make it fit over the outside of the hub but I did it by hand with a curved file (the back side of a flat file) and frequently put it back on the hub to take just a bit of material off at a time to get it centered.
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ok ya the only thing i have installed on the bike is the rear sprocket, I dident want to run it out of center like that.

It did require some filing etc to get it to be perfect center? I unscrewed one of the covers on the hub and dropped the 44tooth right on top of the factory "fixie" rear sprocket, i thought it would be centered by default but it wasnt
 
george_n_texas

george_n_texas

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Sep 4, 2009
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Norm used broken ends of spokes as spacers to center his then bolt it down, I never tried that mine was to small of a hole. It wasn't a fixie.
 
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longo3

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Jul 23, 2012
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tennessee
500 miles on it now. The motor has ate a magneto, shot the muffler cap, and on and on and on. I think you got more to worry about with the motor then the hub, I cant bend it. Its a tall road bike on all road no jumps. 36 will give you more top end but less hill pull. kits sproket will start up a quarter mile 45 degree hill at 35 and be at 25 at top.
 
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reb1

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Aug 15, 2010
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120mm is a standerd for fixies but I would measure the width being that it is a low end bicycle. The quality of the hub is better than your stock hub also.
 
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a0201618

New Member
Jul 22, 2012
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Texas
george_n_texas said:
Well if it's the one I saw on Niagra I doubt it the chain is way wider than a bike chain and so is the sprocket that comes on the engine so I'm guessin it'll slip off. Here are a few other considerations: the less teeth means higher speed at top end but lower torq at low end which means a lot of peddle assist. The fixie has a very large wheel 700c so I'd go with the biggest sprocket that will fit. I weigh 240lbs so low end torq is important.
Click to expand...
Do you or anyone else know where i can get a custom made 36 tooth thread on sprocket that is wider than normal bike sprockets? Here is the link to the sprocket i ordered... http://www.pocketbikeparts.com/Sprocket_Threaded_36_Tooth_p/rksp302185.htm .. Its from a pocket bike website so mabye it is the wider toothed one?
 
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longo3

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Jul 23, 2012
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tennessee
I had to dremel the sprocket center hole. When I did I went fast in circles around the inside just till it fit over the factory sprocket , I guess I got lucky and took off metal evenly its perfect center. I like that 36
 
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