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Motorized Tandems, Trikes and Recumbent Bicycles Trikes (tricycle) and recumbent bicycles can give the ultimate in comfort for cruising on long trips or just around town. Ad an engine and they will really turn some heads.


help a noobie out with sizing

Trikes (tricycle) and recumbent bicycles can give the ultimate in comfort for cruising on long trips or just around town. Ad an engine and they will really turn some heads.


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  #1  
Old 12-04-2011, 09:31 AM
cmh cmh is offline
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Default help a noobie out with sizing

ok i searched for about an hour and its almost imposibile to find what im looking for. i have, what i like to call, a grandma trike. regular old school trike made by schwinn. i need to know what size wheel sprocket i need.

specs:
beach cruiser style trike
212cc predetor engine
11 tooth centrifugal clutch
#40 chain
24" wheels

ok so here is one problem. i weigh 280lbs and im 5'11" and i wanna go fast lol. the guy at northern tool sold me a 8 tooth wheel sprocket and i know that cant be right. the bike doesnt take off. its fast if u pedal the heck out of it and then press the gas. i want more of a "real" motorcycle feel. u know like gas and go. please help.

Last edited by cmh; 12-04-2011 at 09:48 AM.
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Old 12-04-2011, 01:20 PM
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Ibedayank Ibedayank is offline
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Default Re: help a noobie out with sizing

Quote:
Originally Posted by cmh View Post
ok i searched for about an hour and its almost imposibile to find what im looking for. i have, what i like to call, a grandma trike. regular old school trike made by schwinn. i need to know what size wheel sprocket i need.

specs:
beach cruiser style trike
212cc predetor engine
11 tooth centrifugal clutch
#40 chain
24" wheels

ok so here is one problem. i weigh 280lbs and im 5'11" and i wanna go fast lol. the guy at northern tool sold me a 8 tooth wheel sprocket and i know that cant be right. the bike doesnt take off. its fast if u pedal the heck out of it and then press the gas. i want more of a "real" motorcycle feel. u know like gas and go. please help.
8tooth...ummm you need about 12-1 gear reduction


you need a jackshaft
11tooth clutch to a 22tooth on jackshaft then 11 tooth otherside of jackshaft to 72 tooth sprocket on axle will give you 20mph at the governer limit of 3600 rpm no need to pedal like mad before hitting the gas
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  #3  
Old 12-04-2011, 06:36 PM
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nastygramus nastygramus is offline
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Default Re: help a noobie out with sizing

want to go faster BUY A MOTORCYCLE just saying
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Old 12-04-2011, 08:11 PM
cmh cmh is offline
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Default Re: help a noobie out with sizing

Quote:
Originally Posted by Ibedayank View Post
8tooth...ummm you need about 12-1 gear reduction


you need a jackshaft
11tooth clutch to a 22tooth on jackshaft then 11 tooth otherside of jackshaft to 72 tooth sprocket on axle will give you 20mph at the governer limit of 3600 rpm no need to pedal like mad before hitting the gas
thanks... not sure what all of this means but now i know what to tell the guy to sell me..
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Old 12-04-2011, 08:12 PM
cmh cmh is offline
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Default Re: help a noobie out with sizing

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Originally Posted by nastygramus View Post
want to go faster BUY A MOTORCYCLE just saying
thanks for ur expert opinion... ill stick to finishing my bike.
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Old 12-05-2011, 06:57 AM
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nastygramus nastygramus is offline
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Default Re: help a noobie out with sizing

lol sorry if I offended you and your right I dont have a clue about these bikes good luck with your build
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Old 12-05-2011, 09:02 AM
cmh cmh is offline
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Default Re: help a noobie out with sizing

^^^ not offended at all... just wondering why in every forum someone has something negative to say... it was my fauly to ass-u-me that u were that guy...

anyhow,@ ibedayank or anyone else that knows, i have a stupid question. how come regular bikes(two wheel) dont use the jackshaft method but every setup i see on a trike does? am i missing something? trust me i have read i just cant seem to figure it out.

i thought it was as easy as running a chain from the motor directly to the axle of the bike and just trying out different size sprockets till u find one that works... right now u cant see it ,but im wearing my face of shame...lol
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Old 12-05-2011, 10:16 AM
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diceman2004 diceman2004 is offline
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Default Re: help a noobie out with sizing

Jack shaft ... i don,t have a trike , but my guess is that most motor kits run off the left side of the rear wheel . ( on a sprocket attached to the spokes )

you wouldn't be able to do that with a trike . ( you need to drive the axle )

Typicaly , the sprocket on the axle is offset to the right to line up with the pedal sprocket , so you need a jackshaft to transfer the drive ( from the left side of the motor , to the right side of the bike )

Like i say .. i don,t know because i don,t have a trike ( but i would imagine you would also need some sort of shift kit that would let your pedal sprocket freewheel while the motor is running )
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Old 12-05-2011, 02:12 PM
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thegnu thegnu is offline
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Default Re: help a noobie out with sizing

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Originally Posted by diceman2004 View Post
Typicaly , the sprocket on the axle is offset to the right to line up with the pedal sprocket , so you need a jackshaft to transfer the drive ( from the left side of the motor , to the right side of the bike )
the jack shart kit has a freewheel front chain ring thats how its made possible . sickbikeparts.com find the hd jackshaftkit.
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Old 12-05-2011, 02:23 PM
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Ibedayank Ibedayank is offline
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Default Re: help a noobie out with sizing

yeah and a coaster brake hub will handle the power of a HF 212cc motor
think about this for a minute

the motor is mounted BEHIND him

set up the motor to the axle like a gokart and it will be much simpler and last longer
be cheaper to replace parts as they wear out
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