Sprocket choices - Kawasaki Versys Forum
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post #1 of 70 (permalink) Old 06-04-2014, 10:49 AM Thread Starter
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Sprocket choices

I've read about changing sprockets to get a lower rpm at highway speed. So far I'd read about either a 16T front or 45T rear. Today I read about a 44T rear. I believe stock is 15/46? Does anyone know the formula(s) to calculate the change in rpm with various sprocket sizes? Is there a need to alter the chain with any of these options and if so which? Thanks for any and all input.
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post #2 of 70 (permalink) Old 06-04-2014, 11:53 AM
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No Formula, just math.

15:46 = .33
16:46 = .35
15:44 = .34
16:44 = .36

.35 x 100 / .33 = 106
(Where .33 is 100km/h, .35 will be 106km/h at the same RPM.)

or

.33 X 4200 / .35 = 3960
(Where 4200 RPM would get you 60mph with the 15:46, The 16:46 would get you 3960 RPM at the same 60mph.)
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post #3 of 70 (permalink) Old 06-04-2014, 09:29 PM
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Try these...

Simple:
http://www.sprocketcalculator.com/

Expert:
http://www.gearingcommander.com/

Stock is 15/46 (0/0 teeth)

15/44 = 0/-2 is better than 16/46 = +1/0, 16/46 is just that bit too tall eg good for highways but slower accel in city.
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post #4 of 70 (permalink) Old 06-04-2014, 09:53 PM Thread Starter
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My hero was always the tortoise so I doubt it would be a problem. I can always drop down a gear if I need to. I'm thinking 15/43 or maybe even 15/42 to get good highway cruising and mpg returns but probably 15/43. Thanks for the links and the comments everyone.
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post #5 of 70 (permalink) Old 06-04-2014, 10:38 PM
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Going to a 44T rear ate up a lot of chain adjustment on my '09. Something to consider.
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post #6 of 70 (permalink) Old 06-04-2014, 10:42 PM Thread Starter
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I have considered the possibility of needing to shorten the chain one link depending on final selection.
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post #7 of 70 (permalink) Old 06-04-2014, 11:19 PM
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Actually it is a Link 'Pair'... so stock 114 links to 112 link chain
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post #8 of 70 (permalink) Old 06-04-2014, 11:28 PM Thread Starter
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I knew I should have said one notch.
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post #9 of 70 (permalink) Old 06-05-2014, 01:28 PM
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IMHO - be CAREFUL gearing UP. If you're ever in a 'dodgy' situation, trying to turn around in 1st gear, it becomes very easy to get a "cough - STALL" fall-over situation, which can lead to all sorts of complications, to the bike as well as to YOU.


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post #10 of 70 (permalink) Old 06-13-2014, 06:29 PM
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I just replaced my chain and sprockets - got just over 22,000km from the originals. Sounded like a grinder for the last few thousand km though. I ride in the rain a lot and didn't maintain the chain as well as I should have... I had installed a 43 tooth with the stock 15 and loved it. I wanted to install the same sizes, but my local store had issues getting them, so I settled on a 16 tooth front and a 45 tooth rear and and 520 X-ring chain (all JT Sprockets and a heavy duty JT Z1R520 chain). It came with a rivet master link which was a bit of a pain to install, but a ball peen hammer and a big block of steel between chain and rear tire and I was able to peen the rivets over perfectly. The most time was spent cleaning all the nasty chain lube off the wheel and the sprocket areas. Wow... what a difference! The bike is smoother, quieter, less chain snatch, etc. It is even a bit taller than my previous gearing, but works well. It even wheelies better - carries the front further. But as Eddie mentioned, with the fuel injection a bit touchy, slow rpm is a bit dicier. Still worth it in my humble opinion. Dave
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post #11 of 70 (permalink) Old 06-14-2014, 08:52 AM
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I finally put a 44t on a few weeks ago, and there is no slow maneuver issues. First and second are more liveable and freeway revs are down. Overall, much nicer this way.
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post #12 of 70 (permalink) Old 07-08-2014, 10:03 AM
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has anybody ever tried a smaller tooth sprocket for quicker takeoffs? i dont do much highway riding..like the better takeoffs and wheelie fun!
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post #13 of 70 (permalink) Old 07-08-2014, 10:42 AM
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Yes.
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post #14 of 70 (permalink) Old 07-08-2014, 11:56 AM
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or a larger rear sprocket would do the same...
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post #15 of 70 (permalink) Old 07-08-2014, 06:52 PM
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Quote:
Originally Posted by trialsguy View Post
or a larger rear sprocket would do the same...
... and be MUCH easier on your chain than a smaller front sprocket is....

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post #16 of 70 (permalink) Old 07-08-2014, 07:05 PM
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But maybe requiring a longer chain.
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post #17 of 70 (permalink) Old 07-20-2014, 07:36 AM
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Does changing the sprocket throw the speedometer out a little?

Last edited by BKKPhil; 07-20-2014 at 10:49 AM.
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post #18 of 70 (permalink) Old 07-20-2014, 08:08 AM
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Yes, but it is already off.
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post #19 of 70 (permalink) Old 07-20-2014, 10:43 AM
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A 44t rear with stock front on my '09 almost fixed the speedo error.
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post #20 of 70 (permalink) Old 07-20-2014, 10:59 AM
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But it made the odometer error worse.
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