The chart is for manual trans in 4th gear at 65MPH.

 

if it is based of of 65mph, and a 33" tall tire is 635 rotations per mile, and 4:11 is 2720 rpm

635x4.11/2720=.9595 that is the gear ratio the chart is based off of.

on an r1 overdrive is .79 so this chart does not directly apply your rpm would be 635x4.11x.79=2061.7815

its late so please correct me if im wrong

 

ok if its based off fourth then it is right

 

manual trans in 4th gear on an r1 is direct drive so it would still be inaccurate

3.27 and 31s at 70 in 5th = 1960rpm

31x3.141592654/12=8.1157 6160/8.1157x3.27x.79=1960rpm

 

yeah thats right i thought it was based on 5th gear

 

Here is what you're looking for...
http://www.therangerstation.com/tech_library/index.php
Bottom right side of the page under calculators.

Don't re-gear to match what came from the factory with 3.27's, lol.
I don't know which engine you have, but for the most part I would go with 4.10's with 31's if you re-gear.

Here is another good calculator I used before I re-geared. It was very accurate, you need to find out what the gear ratio in 5th is.
http://www.angelfire.com/fl/procrastination/rear.html