Sprocket ratio for Super Crazy build!

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Seagangsta

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Hello everyone,
I'm sure you guys will be able to help me.
I am building a mutant vehicle (art car) for Burning Man.
It will be the nuttiest thing I've ever built, but let me get to the point.
I'm trying to figure out a good sprocket ratio for this monstrosity.
I plan on using a reduction sprocket set-up or two.
This is basically going to be a large, but light weight slow moving vehicle with a go kart drive train.
I have no sprockets for this build yet.
I also have Norther Tool go kart differential for it.

Some specs:
-only needs a top speed of about 15 mph
-GY6 125CC (6.8 hp @ 7,000rpm)
-6 foot wheels (yes 72 inch diameter)
-guessing the chassis fully loaded will weigh around 500-600lbs. with passengers

This thing will be about 26 ft tall x 25 ft x 7 ft wide.
It will be made out of .065 wall steel tubing and other light weight materials.
I know I'm not being very informative here, please let me know what other info you need.
These CAD files are not too detailed and don't show the controls...and that's a futon mattress that you ride on:).

Thank You!
 

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landuse

landuse

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I think you might be asking a bit much with your build. To go at least 15mph, with wheels that big........with a 125cc GY6. You are going to have to gear so low to get it moving that you won't reach those speeds

Lets see what some of the other say
 
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Seagangsta

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Thank you guys for taking the time to reply. I guess I shouldn't have posted this in the "introduce yourself" section...sorry about that. Maybe I should move it.

I know this 125CC GY6 is small for this build but I already have it and if it doesn't work out I guess I can R&R it with a 250CC pretty easily after the build is complete.
The vehicle really only needs to go 10 mph, and will probably weigh closer to 400 lbs fully loaded.
I definitely plan on using at least two jack shafts with some good size sprockets.
I have found some sprocket/gear ratio calculators online but nothing that really made sense for this project.
Is there a way to get a good idea of what this sprocket ratio should be?

Thanks!
 
OzFab

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50:1 @4000rpm will get you 17mph...

The largest sprockets I've seen are around 80 tooth & the smallest is 8, that's a 10:1 ratio... just to give you an idea...

Being that the vehicle will be around 400lbs plus passengers, I'm thinking that's where you should be heading...

Paul, the way to find the top speed using a ratio is simple, just punch the ratio numbers into the speed calculator, as long as it's a whole number, it will spit out a speed...
 
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