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Sprocket Calculator

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lihp
World Chat Champion



Joined: 22 Sep 2010
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PostPosted: 20:27 - 21 Nov 2010    Post subject: Sprocket Calculator Reply with quote
Was bored so wrote a quick Java Application to calculate new top speed with different sprockets. You'll need to know your front and rear sprocket sizes currently, and what you plan to go to, as well as relevant top speed for which ever gear you are calculating.

Code:

// Sprocket calculator

class Sprockets
{
        public static void main (String[] args)
        {

        // Check correct syntax at runtime
        if (args.length != 5)
                {
                System.out.println("Syntax: java Sprockets OrigRear OrigFront NewRear NewFront TopSpeed");
                return;
                }

        //Set Variables and calculations
        double OrigRear = Double.parseDouble(args [0]);
        double OrigFront = Double.parseDouble(args [1]);
        double NewRear = Double.parseDouble(args [2]);
        double NewFront = Double.parseDouble(args [3]);
        double TopSpeed = Double.parseDouble(args [4]);
        double OrigRatio = OrigRear / OrigFront;
        double NewRatio = NewRear / NewFront;
        double n = OrigRatio - NewRatio;
        double u = OrigRatio / TopSpeed;
        double p = OrigRatio + n;
        double NewTopSpeed = p / u;
        int RoundedTopSpeed = (int)NewTopSpeed;

        //Print Result
        System.out.println ("New top speed is " + RoundedTopSpeed + " MPH.");
        }
}


You'll need to copy and paste to a text editor save it as a *.java file and then compile and run it. It will work on all formats.

I've attached the *.class file, though it's uploaded as a *.txt you will need to rename it to *.class

You need Java Runtime Enviroment and run it from command line
Java Sprockets [original rear sprocket teeth] [original front sprocket teeth] [new rear] [new front] [top speed]

For example

Java Sprockets 59 16 59 18 60
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Acemastr
World Chat Champion



Joined: 01 Oct 2008
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PostPosted: 20:43 - 21 Nov 2010    Post subject: Reply with quote
https://www.gearingcommander.com/

Been around for years
____________________
2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited
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yandy_yay
Brolly Dolly



Joined: 01 Aug 2008
Karma :
PostPosted: 20:50 - 21 Nov 2010    Post subject: Reply with quote
Acemastr wrote:
https://www.gearingcommander.com/

Been around for years


+1 ^^^^^^

Also explains about chain and sprocket wear which is quite interesting.... Well i thought it was
____________________
past bikes: (20 years ago) cg-125 (wriiten off), C-50 (thrashed n' finnaly scrapped), CZ-125 (nicked - never recovered, insurance payout was more than i paid for it !!!)
Current bikes: GN 125(now sold), Divvy 600s.
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lihp
World Chat Champion



Joined: 22 Sep 2010
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PostPosted: 20:58 - 21 Nov 2010    Post subject: Reply with quote
That site is kind of cool!

As I said, was bored and wasted time lol. Source is there if anybody else fancies expanding on it, but I cba , it's late!
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Old Thread Alert!

The last post was made 15 years, 315 days ago. Instead of replying here, would creating a new thread be more useful?
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