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Tires, Suspension & Handling Sticky to slippery tire talk

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Old 06-17-2005, 08:58 PM   #1
NewRedRider
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Gearing/Speed Calculator for all bikes

Ok guys. I know a lot of us have been wanting a speed calculator since the switch over to the new forum software. So today I happen to be over at 600RR.com and found one for the 600RR. I took that and did some tweaking so you can use it for any bike. All you have to do is get the gearing ratio and tire size from the manufacturer.

Enjoy!



*Requires MS Excel.

**EDIT - Metric conversions added
Attached Files
File Type: zip Gearing Calcs.zip (5.1 KB, 3169 views)
File Type: zip Gearing Calcs (Metric).zip (4.7 KB, 1112 views)
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Old 06-19-2005, 12:24 AM   #2
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Thanks I've been looking for this !
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Old 06-19-2005, 12:55 AM   #3
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whats the difference between the bluye and yellow?
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Old 06-19-2005, 08:45 AM   #4
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Quote:
Originally Posted by hotskate
whats the difference between the bluye and yellow?
I just highlighted common highway speeds. The blue is interstate average for me.

There's also this one that Mianus posted that's pretty cool. Check it out.

Quote:
Originally Posted by Mianus
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Old 06-19-2005, 10:37 AM   #5
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that's a slick little spreadsheet NewRed. thanks
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Old 06-19-2005, 10:43 AM   #6
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thanx man, that helps
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Old 06-19-2005, 11:19 AM   #7
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yYea its nice!!
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Old 06-23-2005, 05:38 PM   #8
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Is that spreadsheet based on actual calculations or the speedometer readings. What I mean is does the spreadsheet give what speed the speedo is supposed to read (without error)?
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Old 06-23-2005, 06:32 PM   #9
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Quote:
Originally Posted by flamedRRider
Is that spreadsheet based on actual calculations or the speedometer readings. What I mean is does the spreadsheet give what speed the speedo is supposed to read (without error)?
Yes. The calculations are based on the actual gearing ratios in the tranny, the tire profiles, and the sprockets. True speed.
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Old 06-24-2005, 08:02 AM   #10
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cool sheet - how can i change to kms - i see it's protected fields :(
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Old 06-24-2005, 09:43 AM   #11
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wow! with a 16/20 my top speed is 359mph! Im calling sprocket specialists!

very nice, thanks for sharing.
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Old 06-24-2005, 11:12 AM   #12
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Quote:
Originally Posted by NewRedRider
Yes. The calculations are based on the actual gearing ratios in the tranny, the tire profiles, and the sprockets. True speed.
What tire did you use in the assumption? New, used etc.? Because different manufacturers will use different profiles and will change the equation slightly. I.E. GPA's are taller than Powers, etc.
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Old 06-24-2005, 01:19 PM   #13
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is this the same calculations to tweek the speedo healer? if so how do you apply that to the speedo healer?
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Old 06-25-2005, 11:15 AM   #14
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Quote:
Originally Posted by ZARR
cool sheet - how can i change to kms - i see it's protected fields :(
I added a Metric (KPH) spreadsheet for you guys. You really didn't want KPS did you? I assumed you meant KPH.
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Old 06-25-2005, 11:34 AM   #15
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Quote:
Originally Posted by tiltedworld
What tire did you use in the assumption? New, used etc.? Because different manufacturers will use different profiles and will change the equation slightly. I.E. GPA's are taller than Powers, etc.
Good question. Because each manufacturer's idea of what tire profile sizes really are, the calculations are based on standard measurements (mm). If you want to be exact on your calculations break out your micrometer and measure your tire profile. Let's say you measure 180 (mm) width and 105 (mm) hieght/depth. Divide 105 by 180 and you get .583333. Multiply by 100 and you get 58%. So your ACTUAL tire profile would be a 180/58/17. Put these numbers into the sheet and you get your corrected speed for your tire.

However, this would only equate to a 1.6% difference in speed at 15K rpm. Your talking about 3 mph. Not enough for the common rider to worry about.
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Old 06-25-2005, 11:37 AM   #16
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Quote:
Originally Posted by coolaid
is this the same calculations to tweek the speedo healer? if so how do you apply that to the speedo healer?
I haven't used the speedo healer so I don't know how to calibrate it. Now that you have the spreadsheet to verify, maybe someone with the knowledge will post up. You could always send the manufacturer an email and ask them how to calibrate it.
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Old 11-15-2005, 05:01 PM   #17
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that is cool..thanks for sharing
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Old 05-11-2006, 11:52 AM   #18
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Old 08-02-2006, 11:01 AM   #19
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Lots of people asking about gearing changes soooo....

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Old 08-20-2006, 01:46 AM   #20
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Quote:
Originally Posted by NewRedRider
Lots of people asking about gearing changes soooo....

Was looking for this, thanks!
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Old 03-12-2007, 05:41 PM   #21
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Thank god for the SEARCH option on these forums!!!


Bring it back from the dead.

Thanks NewRedRider!
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Old 10-27-2008, 11:05 AM   #22
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My friend's bike is waaaaaay off. It's geared so high that you can run it in 6th gear around town without a problem. I'll show him this.
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Old 03-30-2009, 02:55 PM   #23
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I think this should be "Sticky'ed"
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Old 04-07-2009, 06:54 PM   #24
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^I thought it was....
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Old 11-17-2009, 07:37 PM   #25
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sheet is cool but it doesn't let me change the final drive and my F3 is not 2.688, it's 2.866, why all the protection?
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Old 11-17-2009, 10:16 PM   #26
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sorry for my ignorance, i've figured out that the final drive is nothing more than the rear sprocket teeth / front sprocket teeth and knowing that i've duplicated your spreadsheet, the math is really simple. Thanks for the idea, it's cool to look at this data for different bikes and comparing sprockets for different tracks.
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Old 11-18-2009, 08:53 PM   #27
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NP bro....Glad you figured it out! The protection was to keep people from screwing up the sheet and getting unreliable data. Let me know if you need any help.
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Old 03-07-2010, 09:30 PM   #28
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gearingcommander.com much?
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Old 03-11-2010, 08:33 PM   #29
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anybody have problems unzipping the file?

I'm using winzip and it says I'm trying to unzip an unrecognized file :(
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Old 09-19-2011, 11:25 PM   #30
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Thank YOu!!!
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