Help With Sproket Choices - Kawasaki Ninja 250R Forum
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post #1 of 12 (permalink) Old 11-24-2008, 10:17 PM Thread Starter
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Help With Sproket Choices

Hello everyone - I'm new to this forum so first of all hello. I'm looking for 1000-1500 reduction in RPM, particularly highway at 65mph plus. There are a few ways to arrive at the same gear ratio of what I believe to be target of 2.92+/- for starters.

What would be a better ratio? 14/41, 15/44, or 13/38. These all yield similar gear ratios but do they yield the same resuts? I'm inclined to think since the 250r is very low on torque the 13 tooth front sproket would be easier to spin, yet it's spinning a "heavier" rear sproket if you will. What is your take on the issue & what has anyone tried or is there a formula we can use to simulate wheel hp & torque??
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post #2 of 12 (permalink) Old 11-25-2008, 09:39 AM
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I believe one of the forum members did a +1 on the front sprocket and it help reduced about 500RPM at 80mph, with no noticeable reduction in rideability at low speed. It's cheaper to change the front sprocket than the rear, or both.
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post #3 of 12 (permalink) Old 11-25-2008, 04:28 PM
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post #4 of 12 (permalink) Old 11-25-2008, 05:33 PM
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The front sprocket itself is cheaper, but labor if you don't do it yourself will make it cost more than replacing the rear sprocket. Replacing the rear is easier on labor, just about anyone can do it with some basic tools. The front sprocket takes a little extra oomph in the tool department from what I remember.

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post #5 of 12 (permalink) Old 11-25-2008, 08:09 PM Thread Starter
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Not really too worried about the price. Mainly results.
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post #6 of 12 (permalink) Old 12-05-2008, 11:58 AM
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Ive also had that same concern in the beginging.But after 1000 miles I think the bike performs really well with that sprock combo.So why change the manufactures specs? Same as tires why go with wider ones if its made for the skinny ones? Correct me if Im wrong.
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post #7 of 12 (permalink) Old 08-30-2009, 05:10 AM
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15 tooth countershaft

Best mod going, makes the 250R much more enjoyable. 15/45 is what your looking for 45 is stock rear. Each gear is longer in breadth!
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post #8 of 12 (permalink) Old 09-12-2009, 08:39 AM
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If you go to a 15 front sprocket do you have to add links to the chain?
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post #9 of 12 (permalink) Old 09-20-2009, 05:20 AM
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no chain is plenty long, loosen rear axle and chain adjusters. slide axle forward then readjust, very easy indeed.
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post #10 of 12 (permalink) Old 08-23-2010, 09:27 AM
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resurrecting a dead thread. i put the 14/42 combo on mine. i love it. cruises MUCH better on the interstate. gets me a little better gas mileage. still takes off just fine. i love it.

Last edited by kawboyCAFE; 08-26-2010 at 02:36 PM.
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