Rear sprocket help

Does anybody know the 70 or 80 mph rpm of a stock geared with a 18" rear? (I have the old skool tall 16" tire, same hight as a reg 18" tire) How much would it drop to run the 32t sprocket.


http://www.amckayltd.com/xs650revs.xls

1. Mark your rear tire with chalk on the side wall and on the ground.
2. Roll the bike forward one revolution of the rear wheel and mark the ground again.
3. Measure the distance between the two marks on the ground.
4. That's your rolling distance.

Front and rear sprockets, rolling distance, primary gear ratio and higher speed are pull downs. Just click on them and select your desired value.
 
If your grabbing a hand full of throttle at cruiseing speed and it stumbles your main jet is to big.
 
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