Gear Ratio Calculator

[jpilot]

Thanks for the props guys. I'm glad you find it useful.

 

[iRide Customs]

Got one for MAC? HAHA!

 

[jpilot]

Sorry, no Mac version.

 

[andyinchville1]

Hey Guys,

As promised I finally hooked up my Tach (Sendec) and did some speed VS engine RPM measurements....Sometimes it is hard to try to read both gauges and remember the respective numbers while trying not to crash into anything but I did get some numbers you may find interesting....

At 6000 Engine RPM's the bike was going 31.5 MPH....Of course this was assuming I had the proper circumference programmed into the speedo.....I was using a 26 " wheel mountain bike with a 36 T rear sprocket.....Dax 70 engine

The bike tends to buck and surge at low speeds (approx 13 MPH with low throttle) but
smooths out quickly once 15 MPH is reached....Maybe a boost Bottle will help....(I will have it hooked up soon).

Max RPM I have pulled thus far is 6340.....

Andrew

 

[Dockspa1]

So if we are running a 4:1 reduction at the gearbox and another 4:1 at the sprockets/belts, would that be a total of 8:1 over all?
I am using your very handy calculator to try and figure a belt drive need straight from the engine to the rear pulley and need to know what the best setup is for taking off w/o killing the engine. Like an old belt driven garden tractor.

 

[jpilot]

So if we are running a 4:1 reduction at the gearbox and another 4:1 at the sprockets/belts, would that be a total of 8:1 over all?
I am using your very handy calculator to try and figure a belt drive need straight from the engine to the rear pulley and need to know what the best setup is for taking off w/o killing the engine. Like an old belt driven garden tractor.

Two 4:1 reduction stages would yeild a total ratio of 16:1. You can enter known ratios into the calculator. For example, if you know your first reduction is 4:1 put a 1 in the drive gear/sprocket field and a 4 in the driven gear/sprocket field. Any ratio will work as long as the drive and driven gear sizes are entered in the same units.

I'm glad you're finding the calculator handy. It sure beats banging on a calculator and writing down intermediate results.

Jim

 

[Dockspa1]

You got that right!
Thanks again.

 

[Egor]

Jpilot - Thank You, that is the most handy thing I have seen here. I am just getting ready to design a new type of drive for my happy time bike and this will come in handy. Have fun, Dave

 

[BoltsMissing]

Thanks for this calculator, will help muchly to determine a ratio for my next builds.

 

[Large Filipino]

Got one for MAC? HAHA!

HEY! I run a Mac too! Mac's rule.

..oh and um.....here.

http://www.coulouris.net/software/bikesplash.html