Gearing question - Kawasaki ZX-10R.net
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post #1 of 13 Old 11-15-2010, 10:34 PM Thread Starter
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Gearing question

Anyone tried 15/45 on a 3rd or any gen? The bike is stock slip on only and a 25 shot, @ 62.5 wheelbase. Has been 6.08 @ 125 on spray, trying to dip into 5's on motor, my current gearing is 16/45.
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post #2 of 13 Old 11-21-2010, 11:18 PM
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whats you weight? ive been [email protected] on a stock motor 05 zx10r 15/42 setup with a 4 inch extension you should be more then capable of 5's im sure i can hit em with a 1.5 to 1.4 60...the 15t made a HUGE NIGHT A DAY difference out the hole compared to my 16t
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post #3 of 13 Old 11-22-2010, 12:04 AM
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post #4 of 13 Old 11-22-2010, 02:19 AM Thread Starter
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I weigh 145 maybe 160 suited, and I running -1+4 sprockets. 6.22 is my best pass on motor. However my '60 and '330 where so so, I know it has more with my current setup. With that said I'm still in 1st gear untill just before the '330, this is why I wanna go to a 15t. Which would be -2+4 (15/45), stock was 17/41.
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post #5 of 13 Old 11-22-2010, 02:56 PM
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Originally Posted by mrbzx7 View Post
I weigh 145 maybe 160 suited, and I running -1+4 sprockets. 6.22 is my best pass on motor. However my '60 and '330 where so so, I know it has more with my current setup. With that said I'm still in 1st gear untill just before the '330, this is why I wanna go to a 15t. Which would be -2+4 (15/45), stock was 17/41.
put on a 15t and you will fall in love all over again with your bike
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post #6 of 13 Old 11-22-2010, 05:19 PM
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15T will not majically drop ur times. U need practise. A full system/PC with no flies will help u out too..
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post #7 of 13 Old 11-22-2010, 08:19 PM Thread Starter
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I know there will be a learing curve when changing anything, but I do hope to see some 1.4 60's and high 3's @ the 330'. I'm gonna do it
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post #8 of 13 Old 11-22-2010, 08:44 PM
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I know there will be a learing curve when changing anything, but I do hope to see some 1.4 60's and high 3's @ the 330'. I'm gonna do it
What chain are you running? Just curious, I've been trying to decide on whether to stick with 520 or 525 and have been contemplating 15T also. Just have been reading a lot of mixed reviews regarding the 15T, with some saying they had problems with it skipping and others not.

Best 1/4mi ET: 8.98 @ 147 (stock motor, no turbo/nitrous)
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post #9 of 13 Old 11-22-2010, 09:16 PM
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A bigger sprocket transmits the same torque to the shaft with less pull on the chain and each link has to turn through a smaller angle as it wraps over the sprocket. Beyond that, the only thing that matters is the overall drive ratio.

51/17 is the same drive ratio as 48/16 is the same drive ratio as 45/15, but 51/17 will put the least stress on the chain (and the least pull on the transmission output shaft and the least pull on the suspension and swingarm!) and 45/15 will have the most ...

The other thing to watch for is that with a small drive sprocket, sometimes the chain can rub on the swingarm guides, because it pulls the chain closer to the shaft.


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post #10 of 13 Old 11-22-2010, 09:53 PM
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A bigger sprocket transmits the same torque to the shaft with less pull on the chain and each link has to turn through a smaller angle as it wraps over the sprocket. Beyond that, the only thing that matters is the overall drive ratio.

51/17 is the same drive ratio as 48/16 is the same drive ratio as 45/15, but 51/17 will put the least stress on the chain (and the least pull on the transmission output shaft and the least pull on the suspension and swingarm!) and 45/15 will have the most ...

The other thing to watch for is that with a small drive sprocket, sometimes the chain can rub on the swingarm guides, because it pulls the chain closer to the shaft.
You also have to take into account weight. I do agree with what you're saying though. A 17t weighs more than a 16t or a 15t. And same goes out back. I want the best balance of weight and torque without damaging other things. Personally I wouldn't go smaller than a 16t front. If I need more, then I go bigger on the rear.


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