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Discussion Starter #1
I need Tires, and their Circumferences, in millimeters(mm):

I am working on a gearing calculator, yes, another damn gearing calculator. But this one is suited towards sportbikes, and is fairly simple to use. I will post this up for anyone to use once i have completed it. The calculator itself is just about done, I am still working on finding any left over bugs.

The help I need involves expanding the database(just a text file with a list of bikes and their corresponding stock gears/sprockets/revlimits, and a list of tires with their corresponding circumferences), and I have been having a hard time finding tire circumferences.

If anyone knows the circumference of any rear tires(new) please post up, and i will add them to the list. Please specify manufacturer, size(ie, 180/55/17), and circumference. I am not sure if using the overall diameter will give the correct circumference or not(C = pi*d). If anyone knows this I would greatly appreciate it!

If anyone wants to really help out, they can add any bike, including make, model, year(or range of years), primary gear ratio, 1st thru 6th gear ratio, front and rear sprocket, and rev limit to the list I have below. Please follow the layout below. This list is just what i could find quickly, and might not be exactly correct:

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make model year primary first second third fourth fifth sixth front(sprkt) rear(sprkt) revlimit

honda cbr600f4 1999 1.822 2.833 2.062 1.647 1.421 1.250 1.130 16 45 13500
honda cbr600rr 2005 2.111 2.666 1.937 1.611 1.409 1.261 1.166 16 46 15000
honda cbr929rr 2000 1.521 1.692 1.933 1.6 1.4 1.286 1.190 16 43 11500
honda cbr954rr 2002 1.521 1.692 1.933 1.6 1.4 1.286 1.190 16 43 11700
kawasaki zx6r 2001 2.023 2.823 2.062 1.631 1.38 1.217 1.083 15 40 14000
kawasaki zx6rr 2005 1.891 2.437 2.055 1.722 1.500 1.333 1.227 15 43 16500
kawasaki zx636 2003 2.022 2.923 2.055 1.722 1.450 1.272 1.153 15 40 14500
kawasaki zx636 2005 1.891 2.923 2.055 1.666 1.450 1.272 1.153 15 43 14500
kawasaki zx9r 1998 1.714 2.571 1.941 1.556 1.333 1.2 1.095 16 41 12000
kawasaki z1000 2003-2005 1.714 2.571 1.941 1.555 1.333 1.200 1.095 15 42 10800
suzuki gsxr600 2001 1.926 2.786 2.053 1.682 1.450 1.208 1.086 16 45 14500
suzuki gsxr600 2005 1.926 2.785 2.052 1.681 1.450 1.304 1.181 16 45 15500
suzuki gsxr600 2006 1.974 2.785 2.052 1.714 1.5 1.347 1.208 16 43 15200
suzuki gsxr750 2000 1.857 2.786 2.053 1.682 1.450 1.304 1.182 17 42 14000
suzuki gsxr1000 2001-2003 1.553 2.687 2.052 1.681 1.450 1.304 1.208 17 42 12250
suzuki gsxr1000 2005 1.553 2.562 2.052 1.714 1.500 1.360 1.269 17 42 13500
suzuki gsxr1000 2006 1.553 2.562 2.052 1.714 1.500 1.360 1.269 17 42 13500
suzuki sv650s 2003 2.088 2.461 1.777 1.380 1.125 0.961 0.851 15 44 11000
yamaha yzf-r6 2000 1.955 2.846 1.947 1.556 1.333 1.190 1.083 15 45 15500
yamaha yzf-r6 2005 1.955 2.846 1.947 1.556 1.333 1.190 1.083 16 48 15500
yamaha yzf-r1 2002 1.115 2.5 1.842 1.5 1.333 1.2 1.115 15 45 11750

Tires:
avon 1990
bridgestone 1975
dunlops 1985
metzeler 2000
michelin 1970
pirreli 1980

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As you can see the tire list isn't complete yet, i just entered some BS numbers to verify the program works. I would like to include all indentifiers(ie, aspect, model) in the list when its done.

How many sportbikes only have FIVE gears? I might add that as an option, for now the program uses six gears, but will just print out zeros if no 6th gear is present.

As far as what you can do with the program, you can determine what speed(calculated) you will be traveling in any gear, at any RPM, with any rear tire circum. and gearing setup. If you want to know how much of a difference a new sprocket will make, a few clicks, and u got ur answer. If you want to know what difference a tire will make, voi'la! Of course all these numbers are just calculated, and their accuracy(in relation to GPS or Speedo/Tach) could vary, but I think it will give a good general idea of many common gearing changes made to todays bikes. There are a few other options as well, but for now i am still on the 2nd draft of the program.

I decided to do this, instead of using someone elses program, just cuz I wanted my own, and my friends thought it would be fun. Feel free to add any opinions, but for now i just need data. once i make sure there are no bugs, i will post the "beta" version of the calculator, and make enhancements from that point on.

Thanks for any info I can get!

here is a picture of what it looks like now. when im all done, it may look totally different. if anyone sees anything that i am missing, please let me know. hopefully this will help somebody out, if not, its been fun doing!

 

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Try making a trip to your local tyre shop, they might be willing to help you out.

Sorry but thats all i have to offer.
 

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The last sportsbikes that I can think of with only 5 gears are the Yamaha YZF1000, and the Suzuki GSXR1100. I can't remember if the Yamaha TRX850 has 6 or 5.

Also, the '05/'06 636 has a redline of 15,500rpm, not 14,500.

Your front end looks far more user friendly than any of the calculators I've made, but then I only made them for me.
 

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Discussion Starter #4
I appreciat the info. personnally, i dont care how many tires are on the list. it is just to help out whoever uses the program in the future, but they can add any tire themselves if desired.

nigel, thx, i will correct that. i was doing some test crunches and i was getting extremely high top ends for a few of the bikes, mostly the 1000cc bikes, not sure if that is true "theoritecal" speed(without speed limiter), or my numbers are wrong.

as far as user friendliness goes, that is always Goal #2, right after Goal #1, a working program
 

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The theoretical top speeds will be pretty high for the big bikes. Probably for all of the bikes, actually. I know that the theoretical top speed for my old '95 ZX-6R, according to my calculator, was higher than I ever saw on the speedo, which is inaccurate itself.

Also, when you get to very high speeds, the rear tyre slips a bit. I remember reading that Kawasaki claimed 6% tyre slip for the 2000 ZX-12R at about 300km/h. So for every revolution of the rear wheel, you'd only travel forward about 94% of the rolling circumference.

This means that (in this example) the rear wheel/tyre is doing about 18km/h (~11mph) more than the bike, ie: the wheel is doing 300km/h (187.5mph) and the bike is doing 282km/h (~176mph). Ever wonder why high speeds kill rear tyres?

(I actually find this a bit hard to believe, but then, I've never ridden at that sort of speed)

Including that sort of thing just makes the program a little bit longer though, and I never bothered with it. Apart from that, it's just a guide to see what effect different gears have on speeds. The results don't need to be absolutely exact, as long as they're respectably close.
 
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