Sprocket Gearing... - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 8 (permalink) Old 09-03-2006, 09:51 PM Thread Starter
 
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Sprocket Gearing...

Hey everyone, I bought a 97' ZX7R back in Feb. Well the guy had it geared low. He has it one down on front and 2 up on rear from stock.. My problem is when I'm running down the interstate which i do alot of. I'm turning 6800 at 80 mph, I'm going to change sprockets in the near future. If I add the one tooth back to front and leave the rear like it is how do i go about figure how much it will drop RPM in 6th?? I'm 6'1 and weight about 240 so I think I will probably go with the 2 up on rear still lol Thanks Mike
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post #2 of 8 (permalink) Old 09-03-2006, 09:55 PM
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Nothing wrong with that RPM but gear it to what ever you like.
BTW -1 front = 2+ rear.

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post #3 of 8 (permalink) Old 09-03-2006, 10:36 PM
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Well I have always believe in that the -1 front = +3 rear

First thing to check before ordering your new sprockets.

Check the size of the chain. It may not be stock. Previous owner could have done a 520 coversion.

Second, how far back in the swingarm is your tire? If its way forward due to the larger rear... you may have problems going up in the front.

Then go ahead and do the front swap out... it will be cheaper than doing the rear swap.




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post #4 of 8 (permalink) Old 09-03-2006, 10:45 PM
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Actually I think its somewhere in between and exacts depend on the bike.

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Currently ride 1987 GSXR 50, 1996 Ducati M900, 2005 GSXR 1000
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post #5 of 8 (permalink) Old 09-03-2006, 10:52 PM Thread Starter
 
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The rear tire is just a little past half-way toward the back.. Id just like to get the RPM down on highway to ease up on the vibration and fuel mileage.. Just added a K&N Thursday boy did that make a diffrence on throttle response..
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post #6 of 8 (permalink) Old 09-03-2006, 10:58 PM
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Sounds like you have room to spare.

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post #7 of 8 (permalink) Old 09-04-2006, 07:03 AM
 
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this can help you get exactly what youre looking for: chain/ sprocket calculator
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post #8 of 8 (permalink) Old 09-04-2006, 01:21 PM Thread Starter
 
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Ty that is a nice tool....
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