Tires 26x10.5/16 vs 225/50/15
 

Currently running 24" tall tires on the FC with 4.10 gears. my mph is 127 at/around 7500prms. Best 60ft is 1.83. Trying to avoid shifting in to 5th is the reason for going with a taller tire.
Just got some 26x10.5/16 MT street and the recommended wheel size is 9j. Will a 8j be OK?
Also, how will the taller tire effect my 1/4 mile, 60ft times and mph? If I'm correct the 26" tall tire will give me 130 at 7000rpms and 140mph at 8000rpms. 140mph is my goal.

thanks
chuck